期刊
RSC ADVANCES
卷 8, 期 41, 页码 23019-23026出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra03162b
关键词
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资金
- Basic Research Project of Shanxi Province [201701D221079]
- National Natural Science Foundation of China [61475110, 21471111, 61404089, 61504090, 61604104]
- CAS Key Laboratory of Renewable Energy [Y807k31001]
- Youth Foundation of Taiyuan University of Technology [2015QN102]
- National Key Research and Development Program of China [2016YFB0401803]
- Basic Research Projects of Shanxi Province [2015021103, 201601D202029]
- Shanxi Provincial Key Innovative Research Team in Science and Technology [201605D131045-10]
- Platform and Base Special Project of Shanxi [201605D131038]
The instability of perovskite films is a major issue for perovskite solar cells based on ZnO electron transport layers (ETLs). Here, ZnO nanoparticle (NP)- and ZnO sol-gel layers capped with low-temperature processed TiO2, namely ZnO/TiO2 bilayered films, have been successfully employed as ETLs in highly efficient MAPbI(3)-based perovskite solar cells. It is demonstrated that these ZnO/TiO2 bilayered ETLs are not only capable of enhancing photovoltaic performance, but also capable of improving device stability. The best device based on the ZnO/TiO2 bilayered ETL exhibits an efficiency of approximate to 15% under standard test conditions and can retain nearly 100% of its initial efficiency after 30 days of atmosphere storage, showing much higher device performance and stability compared to those devices based on ZnO single-layer ETLs. Moreover, it is found that perovskite films and devices prepared on the single ZnO sol-gel ETLs are much superior to those deposited on the single ZnO NP-ETLs in both stability and performance, which can be ascribed to fewer surface hydroxyl groups and much smoother surface morphology of the ZnO sol-gel films. The results pave the way for ZnO to be used as an effective ETL of low-temperature processed, efficient and stable PSCs compatible with flexible substrates.
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