بررسی ویژگی‌های ساختاری و نوری لایه‌‌های پروسکایتی CH3NH3SnI3 سنتز شده به روش تبخیر گرمایی تک مرحله‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی شاهرود

چکیده

در این پژوهش، نخست لایه­های نازک MASnI3 به روش آسان و کم هزینه تبخیر گرمایی تک مرحله­ای بر زیرلایه­هایی از جنس شیشه، SnO2:F (FTO) و TiO2 مزومتخلخل سنتز شدند و سپس، ویژگی­های ساختاری، ریخت­شناسی و نوری آنها بررسی گردید. طرح­های پراش پرتو ایکس (XRD) و طیف­های رامان نمونه­ها نشان دادند که همه لایه­ها دارای ساختار پروسکایتی چارگوشی در فاز α هستند. بررسی پارامترهای ساختاری لایه­ها و همچنین تصاویر میکروسکوپ الکترونی روبشی اثر میدان (FESEM) از سطح آنها نشان داد که بلورینگی و ریختار لایه­ها با تغییر زیرلایه­ها به طور محسوسی تغییر می­کنند. همچنین بررسی ویژگی­های اپتیکی لایه­های پروسکایتی سنتز شده نشان داد که با وجود ضخامت کم لایه­ها (حدود nm 200)، همه آنها، به ویژه لایه پروسکایتی نهشته شده روی زیرلایه FTO، دارای ضریب جذب بالایی (از مرتبه cm-1 105) در گستره طول موجی مورد استفاده برای سلول­های خورشیدی پروسکایتی هستند. این نتیجه به همراه مقادیر گاف نواری محاسبه شده برای لایه­ها (eV 28/1-53/1) نشان می­دهد که لایه­های سنتز شده گزینه بسیار مناسبی به عنوان لایه جاذب در سلول­های خورشیدی پروسکایتی هستند.    

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of structural and optical properties of CH3NH3SnI3 Perovskite layers synthesized by one-step thermal evaporation technique

نویسندگان [English]

  • Asadpour Arzefooni
  • Izadifard
  • Ghazi
چکیده [English]

In this study, CH3NH3SnI3 Perovskite thin films were­ prepared on different substrates, Glass, FTO, and mesoporous TiO2 by easy and cheap thermal evaporation method in one step. Then, structural, morphology and optical properties of the layers were investigated. The XRD patterns and Raman spectra showed that all samples have α-phase tetragonal Perovskite structures and crystallinity, as well as the morphology of the samples significantly changes as the substrates changes. Investigation of the optical properties of the samples showed that despite small thickness of the layers (about 200 nm), the absorption coefficient of the layers (specially the layer grown on FTO substrate) is significantly large (in order of 105 cm-1). This result with the values of the bandgap of the layers (1.28-1.53 eV) show that the synthesized CH3NH3SnI3 Perovskite thin films are a very good candidate for using in solar cells as absorber layers.

کلیدواژه‌ها [English]

  • Perovskite solar cells
  • thermal evaporation method
  • CH3NH3SnI3 absorber layers
  • Organic-inorganic halide Perovskite

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  • تاریخ دریافت: 02 بهمن 1398
  • تاریخ بازنگری: 16 فروردین 1399
  • تاریخ پذیرش: 20 اردیبهشت 1399

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