钙钛矿(结构)
载流子
兴奋剂
材料科学
能量转换效率
钙钛矿太阳能电池
电子迁移率
太阳能电池
工程物理
光电子学
纳米技术
物理
化学
结晶学
作者
Chao Zhen,Tingting Wu,Runze Chen,Luyao Wang,Gang Liu,Hui‐Ming Cheng
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2019-02-14
卷期号:7 (5): 4586-4618
被引量:85
标识
DOI:10.1021/acssuschemeng.8b06580
摘要
The research on solution processed metal halide perovskite solar cells (PSCs) as a new type of solar cells has experienced explosive growth since the first report in 2009. It is impressive that solar energy conversion efficiency has increased to over 23%. Outstanding optoelectronic properties including high absorption coefficient, high mobility, and long diffusion length of charge carriers have been revealed in the family of hybrid organic inorganic halide perovskite materials that are considered the heart of solar cells. A long-anticipated feature for solar cells that the diffusion lengths of charge carriers outstrip the active layer thickness of a device has been demonstrated in PSCs so that the efficiency of extracting photocarriers, particularly electrons at the interfaces becomes a key parameter controlling global device performance. The n-type semiconductor TiO2 with the merits of thermal and chemical stability, low cost, and suitable band edge positions has been regarded an ideal electron transporting layer (ETL) material in PSCs performing the function of selectively extracting photoelectrons and subsequently delivering them toward a current collector. Besides the highly concerning energy conversion efficiency of PSCs, the challenge of the current–voltage hysteresis phenomenon and instability of PSCs are also revealed to be closely related with TiO2 ETLs. In this review, the recent progress on strategies for modifying TiO2 ETLs by controlling morphology, surface modification, doping, and constructing composites to improve global performance of PSCs is reviewed. Moreover, the perspective on future development of TiO2 based ETLs for high performance PSCs is proposed on the basis of the comprehensive and deep understanding of TiO2 from the area of photocatalysis. It is anticipated that finely tailoring the features and properties of TiO2 ETLs will further release large room for exciting enhancements in the global performance of PSCs.
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