材料科学
钙钛矿(结构)
钝化
磁滞
光催化
紫外线
图层(电子)
能量转换效率
化学工程
光电子学
纳米技术
催化作用
化学
有机化学
工程类
物理
量子力学
作者
Yiqiang Zhang,Xiaotao Liu,Pengwei Li,Yanyan Duan,Xiaotian Hu,Fengyu Li,Yanlin Song
出处
期刊:Nano Energy
[Elsevier]
日期:2019-02-01
卷期号:56: 733-740
被引量:197
标识
DOI:10.1016/j.nanoen.2018.11.068
摘要
Even though TiO2 is the most widely used electron transport layer (ETL) in high-efficiency perovskite solar cells (PSCs), ultraviolet photocatalysis and existence of intrinsic oxygen vacancies result in interfacial charge recombination and poor long-term photo-stability for TiO2-based PSCs under full spectral continuous illumination. To solve the issues, here we report dopamine-capped TiO2 nanoparticles as ETL via chelating effect to improve interfacial binding with perovskite active layer. The introduction of dopamine can substantially reduce oxygen vacancies and suppress deep trap states within TiO2. In addition, the terminal amino groups in dopamine can passivate the uncoordinated Pb atoms and decrease the Pb-I/Br antisite defects on the interface of perovskite/TiO2. As an interfacial crosslinking agent, dopamine can not only reduce charge-accumulation and charge-recombination rate, but also increase charge-extraction efficiency at the TiO2 and perovskite interface. Based on the dopamine-capped TiO2 nanoparticles surface, the corresponding planner Cs0.05FA0.81MA0.14PbI2.55Br0.45 PSCs deliver a power conversion efficiency of nearly 21% with negligible hysteresis. Moreover, unencapsulated devices retain 80% of their initial performance after 1200 h operation under constant full-sun illumination in nitrogen atmosphere. Ideally, this chemical-bath-deposited dopamine-modified TiO2 provides an effective commercialized route for efficient and photostable planar PSCs.
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