KARIŞIK HALOJENLİ PEROVSKİT FİLMLERİN TERMAL EŞ-BUHARLAŞTIRMA YÖNTEMİ İLE ÜRETİLMESİ

Abstract

Perovskit tabakalarının termal eş-buharlaştırma yöntemi ile üretilmeleri güneş hücrelerinde kullanılmak üzere geniş alana sahip, delik kusuru bulunmayan ve homojen filmlerin üretilmesini sağlayan önemli bir tekniktir. Bu çalışmada, tüm aralığı kapsayan (0≤x≤3) farklı Br/I oranına dolayısı ile farklı bant aralıklarına sahip MAPbI_3-xBr_x perovskit tabakalar eş-buharlaştırma yöntemi ile ilk kez üretilmişlerdir. Geliştirilen filmlerin optik ve yapısal analizleri fotolüminesans, UV-Vis spektrometresi, X-ışını kırınımı ve taramalı elektron mikroskobu ile yapılmıştır. Bu çalışma termal eş-buharlaştırma tekniği ile farklı bant genişliğine sahip homojen perovskit tabakaların elde edilmesinin mümkün olduğunu göstermektedir. Bu çalışmada geliştirilen Stokes kaymasına sahip olmadığı gözlemlenen MAPbI₂Br perovskit filmi, özellikle yüksek verimli perovskit/silisyum çok eklemli güneş hücrelerinin elde edilebilmesi için önemlidir.

Keywords

• Bant aralığı ayarlanabilirliği,termal eş-buharlaştırma,perovskit

FABRICATION OF MIXED HALIDE PEROVSKITE FILMS BY THERMAL CO-EVAPORATION

Abstract

Thermal co-evaporation is a versatile method to fabricate highly uniform, large area and pin-hole free perovskite films for solar cells. In this study, perovskite films (MAPbI_3-xBr_x) were fabricated entirely by thermal co-evaporation in the full range (0≤x≤3) with different Br/I ratio for the first time. Films were characterized optically and structurally using photoluminescence and UV-Vis spectroscopy, X-ray diffraction and scanning electron microscopy. This work presents capability of thermal co-evaporation to fabricate highly-uniform perovskite films at the desired band gaps. MAPbI₂Br film, developed in this study, exhibits no Stokes shift, and therefore is particularly suitable in achieving high efficiency perovskite/silicon tandem solar cells.

Keywords

• Band gap tuning,thermal co-evaporation,perovskite

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