Insights into optoelectronic properties of anti-solvent treated perovskite films
Insights into optoelectronic properties of anti-solvent treated perovskite films
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DOI：
10.1007/s10854-017-7451-z
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发表时间：
2017-07
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通讯作者：
Asmat Nawaz;Ali Koray Erdinc;Burak Gultekin;M. Tayyib;C. Zafer;Kaiying Wang;M. Akram;K. Wong;S. Hussain;L. Schmidt‐Mende;A. Fakharuddin
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作者：
Asmat Nawaz;Ali Koray Erdinc;Burak Gultekin;M. Tayyib;C. Zafer;Kaiying Wang;M. Akram;K. Wong;S. Hussain;L. Schmidt‐Mende;A. Fakharuddin
过去几年钙钛矿太阳能电池的卓越性能主要源于钙钛矿薄膜成分和形态的改进。钙钛矿膜的抗溶剂处理是一种广泛采用的方法，其中引入不同于用于前体溶液的溶剂以促进钙钛矿晶体的快速结晶并获得均匀的无针孔膜。最近发表了各种报告，以了解溶剂萃取机制，电性能以及钙钛矿薄膜的抗溶剂处理对器件性能和稳定性的影响。在这里，我们报告了一些关于电荷载流子动力学，结晶度，更重要的是，抗溶剂处理的钙钛矿薄膜的能级变化的更多见解。的紫外-可见吸收，光致发光，和光电子能谱测量揭示了向下移动的MAPbI 3钙钛矿的能量水平时，与抗溶剂处理。能级移动有利于界面电荷转移，并导致显着的开路电压~1.08 V和光电转换效率8.21%，分别从0.61 V和1.3%的未处理的膜，在环境条件下制备的器件。
The remarkable performance in perovskite solar cells over the past few years primarily stemmed from an improvement in perovskite film composition and morphology. Antisolvent treatment of perovskite films is one such widely adopted method where a solvent other than that used for precursor solution is introduced to facilitate rapid crystallization of perovskite crystals and to obtain a homogeneous pin-hole free film. Various reports are published recently to understand solvent extraction mechanism, electrical properties and the effect of antisolvent treatment of perovskite film on device performance and stability. Herein, we report some more insights on the charge carrier dynamics, crystallinity and more importantly, the change in energy levels of antisolvent treated perovskite films. The UV–vis absorption, photoluminescence, and photoelectron spectroscopy measurements revealed a downward shift in energy levels of MAPbI3perovskite when treated with an antisolvent. The energy level shift favoured interfacial charge transfer and resulted in remarkable open-circuit voltage ~1.08 V and photoconversion efficiency 8.21% up from 0.61 V and 1.3% for a non-treated film, respectively for devices prepared at ambient conditions.