期刊
RSC ADVANCES
卷 6, 期 63, 页码 57996-58002出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra12126h
关键词
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资金
- National Natural Science Foundation of China [51502239]
- China Postdoctoral Science Foundation [2015M582659]
- Research Fund for the Doctoral Program of Higher Education of China [20120201130004]
- Science and Technology Developing Project of Shaanxi Province [2015KW-001]
- 111 Project of China [B14040]
Zinc oxide (ZnO) has been demonstrated to be a superb electron selective contact material in photovoltaic devices for its high electron mobility and various accessible nanostructures. However, issues of severe charge recombination and thermal instability occurring at the perovskites/ZnO interface hinder its application on perovskite solar cells. Herein, we report a strategy of TiO2 passivation onto the surface of ZnO nanorods (NRs) using a wet-chemical method, where a device structure FTO/ZnO NRs/TiO2 passivation layer/CH(3)NH(3)Pbl(3)/spiro-OMeTAD/Ag is adopted. Based on the proposed strategy, an overall power conversion efficiency (PCE) of 13.49% is achieved mainly due to the improved open-circuit voltage (V-oc) of 1.02 V, shirt-circuit current density (J(sc)) of 20.69 mA cm(-2), and fill factor (FF) of 0.64, which are much higher than those of bare ZnO NRs-based devices. Interestingly, TiO2 passivated samples show much better long-term device stability than those without passivation, where TiO2 acts as a buffer layer with improved thermal stability owning to reduced chemisorbed hydroxyl groups as indicated by X-ray photoelectron spectroscopy.
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