fa بررسی عددی قابلیت پاسخ‎ دهی در آشکارسازهای ناحیه مادون قرمز میانی با سمیت کم مبتنی بر نقاط کوانتومی Ag2Se-PbS عمومى General پژوهشي Research <div style="text-align: justify;"><span style="line-height:2;"><span style="font-size:12px;"><span style="font-family:Tahoma;"><span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="AR-SA"><span style="color:red">مقدمه:</span></span></b><span lang="AR-SA"><span style="color:#000000;">حسگر های نوری</span></span><b><span lang="AR-SA"><span style="color:#000000;">، ب</span></span></b><span lang="AR-SA"><span style="color:#000000;">خ</span><span style="color:black">ش جدایی ن</span></span><span lang="AR-SA"><span style="color:black">اپذیر از تجهیزات مختلف در زمینه تشخیصی زیست پزشکی هستند. در این میان فناوری</span></span><span lang="FA"><span style="color:black">&lrm; ه</span></span><span lang="AR-SA"><span style="color:black">ای فوتونیکی به ع</span></span><span lang="AR-SA"><span style="color:black">لت دارابودن مزایای فراوان، برای استفاده به عنوان حسگر در کاربردهای پزشکی و پایش سلامت انسان، محبوبیت فراوان کسب کرده</span></span><span lang="FA"><span style="color:black">&lrm;&nbsp;</span></span><span lang="AR-SA"><span style="color:black">اند. دارابودن حساسیت بالا، امکان ادغام با ادوات الکترونیکی، فشردگی مناسب افزاره، عملکرد بدون فلز، هزینه ارزان و ایمنی الکترومغناطیسی که فناوری ه</span></span><span lang="AR-SA"><span style="color:black">ای فوتونیکی ارائه می</span></span><span lang="FA"><span style="color:black">&lrm;</span></span><span lang="AR-SA"><span style="color:black">کنند، لزوم مطالعه در زمینه حسگرهای نوری را توجیه می</span></span><span lang="FA"><span style="color:black">&lrm;</span></span><span lang="AR-SA"><span style="color:black">کنند. </span><span style="color:black"></span></span></span></span><br> <span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="AR-SA"><span style="color:red">روش بررسی:</span></span></b><span lang="AR-SA"><span style="color:black"> در این مطالعه تاثیر</span></span> <span lang="AR-SA"><span style="color:black">درصد ترکیب نقاط کوانتومی </span></span><span dir="LTR"><span style="color:black">PbS</span></span><span lang="AR-SA"><span style="color:black"> و </span></span><span dir="LTR"><span style="color:black">Ag2Se</span></span><span lang="AR-SA"><span style="color:black">، همچنین تغییرات اندازه قطر و چگالی آلایش فیلم نقاط کوانتومی </span></span><span dir="LTR"><span style="color:black">Ag2Se</span></span><span style="color:black"> در ناحیه فعال در دماهای مختلف برای بیشینه س</span><span lang="AR-SA"><span style="color:black">ازی قابلیت پاسخ د</span></span><span lang="AR-SA"><span style="color:black">هی نوری مورد مطالعه قرار گرفته است. برای دستیابی به قابلیت پاسخ د</span></span><span lang="AR-SA"><span style="color:black">هی نوری براساس ساختار نقاط کوانتومی ابتدا با حل خودسازگار معادلات شرودینگر و پواسون به روش تفاضل محدود، چگالی الکترون در هر تراز و پروفایل پتانسیل به د</span></span><span lang="AR-SA"><span style="color:black">ست آ</span></span><span lang="AR-SA"><span style="color:black">مده و قابلیت پاسخ دهی نوری آشکارساز محاسبه می‌گردد.</span></span></span></span><br> <span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="AR-SA"><span style="color:red">یافته ها</span></span></b><b><span lang="AR-SA"><span style="color:red">:</span></span></b><span lang="AR-SA"><span style="color:black"> نتایج به دست آ</span></span><span lang="AR-SA"><span style="color:black">مده نشان می‌دهد با افزایش درصد ترکیب نقاط کوانتومی </span></span><span dir="LTR"><span style="color:black">PbS</span></span><span lang="AR-SA"><span style="color:black"> نسبت به نقاط کوانتومی </span></span><span dir="LTR"><span style="color:black">Ag2Se</span></span><span style="color:black"> &nbsp;قابلیت پاسخ دهی</span><span lang="AR-SA"><span style="color:black">&nbsp;افزاره کاهش می یابد. با افزایش چگالی آلایش فیلم </span></span><span dir="LTR"><span style="color:black">Ag2Se</span></span><span lang="AR-SA"><span style="color:black"> در ابتدا </span></span><span lang="FA"><span style="color:black">&lrm;به د</span></span><span lang="AR-SA"><span style="color:black">لیل افزایش حامل‌ها برای تحریک نوری، قابلیت پاسخ</span></span><span lang="FA"><span style="color:black">&lrm;&nbsp;</span></span><span lang="AR-SA"><span style="color:black">دهی نوری افزایش ی</span></span><span lang="AR-SA"><span style="color:black">افته و پس ا</span></span><span lang="AR-SA"><span style="color:black">ز رسیدن به نقطه بیشینه با افزایش بازترکیب حامل</span></span><span lang="FA"><span style="color:black">&lrm;&nbsp;</span></span><span lang="AR-SA"><span style="color:black">ها قابلیت پاسخ د</span></span><span lang="AR-SA"><span style="color:black">هی نوری کاهش می</span></span><span lang="FA"><span style="color:black">&lrm;</span></span><span lang="AR-SA"><span style="color:black">یابد. قابلیت پاسخ د</span></span><span lang="AR-SA"><span style="color:black">هی نوری با افزایش قطر نقاط کوانتومی </span></span><span dir="LTR"><span style="color:black">Ag2Se</span></span><span lang="AR-SA"><span style="color:black"> به دلیل تأثیر محصور</span></span><span lang="FA"><span style="color:black">&lrm;</span></span><span lang="AR-SA"><span style="color:black">شدن کوانتومی، فرار حامل ه</span></span><span lang="AR-SA"><span style="color:black">ا و اثرات تونل</span></span><span lang="FA"><span style="color:black">&lrm;</span></span><span lang="AR-SA"><span style="color:black">زنی افزایش ی</span></span><span lang="AR-SA"><span style="color:black">افته و بعد از رسیدن به نقطه بیشینه کاهشی می</span></span><span lang="FA"><span style="color:black">&lrm;</span></span><span lang="AR-SA"><span style="color:black">گردد.</span></span></span></span><br> <b><span dir="RTL" lang="AR-SA"><span style="color:red">نتیجه&lrm; گیری</span></span><span style="color:red">:</span></b><span dir="RTL"><span style="color:black"> امروزه افزایش راندمان کوانتومی و قابلیت پاسخ</span></span><span dir="RTL" lang="FA"><span style="color:black">&lrm;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">دهی نوری برای حسگرهای نوری زیست</span></span><span dir="RTL" lang="FA"><span style="color:black">&lrm;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">پزشکی،چالش بزرگی برای مهندسان تجهیزات پزشکی است. به&lrm; طور</span></span><span dir="RTL" lang="FA"><span style="color:black">&lrm;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">کلی بیشینه</span></span><span dir="RTL" lang="FA"><span style="color:black">&lrm;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">سازی قابلیت پاسخ</span></span><span dir="RTL" lang="FA"><span style="color:black">&lrm;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">دهی نوری موجب بهبود عملکرد، دقت و ارتقا کارایی آشکارسازها&nbsp;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">شده و با مهندسی ساختار ادوات می</span></span><span dir="RTL" lang="FA"><span style="color:black">&lrm;</span></span><span dir="RTL" lang="AR-SA"><span style="color:black">توان به این امر دست یافت.</span></span></span></span></span></div> <span style="font-size:11pt"><span style="line-height:90%"><span style="font-family:Calibri,sans-serif"><b><i><span style="font-size:9.5pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times=""><span style="color:red">Introduction:</span></span></span></span></i></b><b> </b><span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">Optical sensors are an integral part of various devices in the field of biomedical diagnostics. In the meantime, photonic technologies have gained great popularity for use as sensors in medical applications and human health monitoring due to their many advantages such as high sensitivity, the possibility of integration with electronic devices, suitable compactness of the device, metal-free operation, cheap cost, and electromagnetic safety that photonic technologies provide, justify the need to study in the field of optical sensors.</span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:90%"><span style="font-family:Calibri,sans-serif"><b><i><span style="font-size:9.5pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times=""><span style="color:red">Analysis method:</span></span></span></span></i></b><b>&nbsp; </b><span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">In this study, the effect of the composition percentage of PbS and Ag₂Se quantum dots, as well as the changes in the diameter and film doping density of Ag₂Se quantum dots in the active region at different temperatures to maximize the responsivity has been studied. To achieve the responsivity of the photodetector based on the structure of quantum dots, first by solving the self-consistent Schr&ouml;dinger and Poisson equations with the finite difference method, the electron density in each level and potential profile is obtained and the responsivity of the photodetector is calculated.</span></span></span><b><span dir="RTL" lang="AR-SA" style="font-size:10.0pt"><span style="line-height:90%"><span style="font-family:"B Nazanin""></span></span></span></b></span></span></span><br> <span style="font-size:11pt"><span style="line-height:90%"><span style="font-family:Calibri,sans-serif"><b><i><span style="font-size:9.5pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times=""><span style="color:red">Results:</span></span></span></span></i></b><b> </b><span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">The obtained results show that with the increasing percentage of PbS quantum dots compared to Ag₂Se quantum dots, the responsivity of the device decreases. By increasing the film doping density of the Ag₂Se quantum dots, initially due to the increase of carriers for optical excitation, the responsivity increases, and after reaching the maximum point, the responsivity decreases because of the increase of carrier recombination. The responsivity increases with the increase in the diameter of Ag₂Se quantum dots due to the quantum confinement effects, carrier escape, and tunneling effects and decreases after reaching the maximum point.</span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:90%"><span style="font-family:Calibri,sans-serif"><b><i><span style="font-size:9.5pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times=""><span style="color:red">Conclusion:</span></span></span></span></i></b><b> </b><span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">Nowadays,</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">increasing</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">the</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">quantum</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">efficiency</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">and</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">optical</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">responsivity</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">of</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">such</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">biomedical</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">optical</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">sensors</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">is</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">a</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">great</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">challenge</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">for</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">medical</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">device</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">engineers.</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">In</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">general,</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">maximizing</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">the</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">responsivity</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">improves</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">the</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">performance,</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">accuracy,</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">and</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">efficiency</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">of</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">the</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">photodetectors,</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">and</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">this</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">can</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">be</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">achieved</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">by</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">engineering</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">the</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">structure</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">of</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">the</span></span></span> <span style="font-size:10.0pt"><span style="line-height:90%"><span new="" roman="" style="font-family:" times="">devices.</span></span></span></span></span></span> آشکارساز نوری, بیو‎فوتونیک, قابلیت پاسخ‎دهی نوری, نقاط کوانتومی Bio-Photonic, Optical Responsivity, Photodetector, Quantum Dot 7 14 http://icml.ir/browse.php?a_code=A-10-536-6&slc_lang=fa&sid=1 mehdi Khodaverdizadeh مهدی خداوردی زاده m.khodaverdi@uut.ac.ir 1050031947532846005103 1050031947532846005103 Yes گروه مهندسی اپتیک و لیزر، دانشکده فناوری های صنعتی، دانشگاه صنعتی ارومیه، ارومیه asghar asgari اصغر عسگری 1050031947532846005104 1050031947532846005104 No دانشکده فیزیک، دانشگاه تبریز، تبریز