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ویژگیهای اپتیکی پروسکایتهای دوگانه Cs2AgBiX6 (X=Br or Cl) با دو رهیافت کوهن-شم و تابع گرین | ||
فصلنامه علمی اپتوالکترونیک | ||
دوره 7، شماره 1 - شماره پیاپی 18، آبان 1403، صفحه 9-18 اصل مقاله (560.27 K) | ||
نوع مقاله: پژوهشی | ||
شناسه دیجیتال (DOI): 10.30473/jphys.2024.71748.1198 | ||
نویسندگان | ||
اسماء مرادی* 1؛ علی مختاری2 | ||
1دانشجوی دکتری، گروه فیزیک، دانشکده علوم، دانشگاه شهرکرد، شهرکرد، ایران. | ||
2دانشیار، گروه فیزیک، دانشکده علوم، دانشگاه شهرکرد، شهرکرد، ایران. | ||
چکیده | ||
در کار حاضر ویژگیهای ساختاری، الکترونی و اپتیکی پروسکایتهای دوگانه بدون سرب با فرمول کلی (X=Br or Cl) Cs2AgBiX6 در چارچوب نظریه تابعی چگالی (DFT) و با استفاده از تقریبهای چگالی موضعی (LDA) و شیب تعمیم یافته (GGA) توسط بسته محاسباتی ابینیت بررسی شده است. این ترکیبها با پایداری مناسب و عدم سمیت جایگزین خوبی برای پروسکایتهای هالید سربی هستند. برانگیختگیهای نوری پروسکایتهای دوگانه به دلیل گاف نواری بهینه در محدوده نور مرئی و انرژی پیوند اکسیتونی کم، اهمیت دارد. ویژگیهای اپتیکی شامل: ضرایب جذب، شکست، خاموشی و بازتاب و تابع اتلاف با استفاده از رهیافتهای تقریب فاز تصادفی در کوهن-شم (RPA-KS) و گرین (RPA-GW) بهدست آمدهاند. نتایج در رهیافت تابع گرین در مقایسه با رهیافت کوهن-شم، تطابق بهتری با نتایج کارهای تجربی دارد. در ناحیه طیف نور مرئی، پلاسمونهای حجمی وجود ندارند و میزان اتلاف انرژی کم است. | ||
کلیدواژهها | ||
پروسکایت دوگانه؛ سلول خورشیدی؛ نظریه تابعی چگالی؛ ویژگیهای اپتیکی؛ تابع گرین | ||
عنوان مقاله [English] | ||
Optical Properties of the Cs2AgBiX6 (X=Br or Cl) Double Perovskites Using Both Kohn-Sham and Green's Function Approaches | ||
نویسندگان [English] | ||
Asma Moradi1؛ Ali Mokhtari2 | ||
1Ph.D. Student, Departement of Physic, Faculty of Science, Shahrekord University, Shahrekord, Iran | ||
2Associate Professor, Departement of Physic, Faculty of Science, Shahrekord University, Shahrekord, Iran. | ||
چکیده [English] | ||
In the present work, the structural, electronic and optical properties of the lead-free double perovskites Cs2AgBiX6 (X=Br or Cl) are analyzed in the framework of density functional theory approximation (LDA) and generalized gradient approximation (GGA) with the Abinit computational package. These compounds are good alternative to lead halide perovskites due to their good stability and non-toxicity. The optical excitations of the double perovskites are important due to their optimal band gap in the visible light spectrum and low excitonic binding energy. The optical properties including: absorption, refraction, extinction and reflection coefficients and loss function, are obtained using random phase approximation in the Kohn-Sham (RPA-KS) and Green's (RPA-GW) approaches. The results of the Green's function approach are in better agreement with the results of experimental works compared to the RPA-KS approach. In the visible region, there are not volume plasmons, and the amount of energy loss is low | ||
کلیدواژهها [English] | ||
Double Perovskite, Solar Cell, Density Functional Theory, Optical Properties, Green's Function | ||
مراجع | ||
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