期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201900834
关键词
morphological control; nanocrystal regrowth; perovskite solar cells; room temperature; tin dioxide
类别
资金
- National Natural Science Foundation of China [91433205, 51773025, 51872036]
- Tsinghua University Initiative Scientific Research Program
- Fundamental Research Funds for the Central Universities [DUT18ZD208]
- US National Science Foundation [OIA-1538893]
- Energy Materials and Surface Sciences Unit of the Okinawa Institute of Science and Technology Graduate University
- OIST Proof of Concept (POC) Program
- OIST RAMP
- D Cluster Research Program
- JSPS KAKENHI [JP18K05266]
Electron transport layer (ETL) is a functional layer of great significance for boosting the power conversion efficiency (PCE) of perovskite solar cells (PSCs). To date, it is still a challenge to simultaneously reduce the surface defects and improve the crystallinity in ETLs during their low-temperature processing. Here, a novel strategy for the mediation of in situ regrowth of SnO2 nanocrystal ETLs is reported: introduction of controlled trace amounts of surface absorbed water on the fluorinated tin oxide (FTO) or indium-tin oxide (ITO) surfaces of the substrates using ultraviolet ozone (UVO) pretreatment. The optimum amount of adsorbed water plays a key role in balancing the hydrolysis-condensation reactions during the structural evolution of SnO2 thin films. This new approach results in a full-coverage SnO2 ETL with a desirable morphology and crystallinity for superior optical and electrical properties, as compared to the control SnO2 ETL without the UVO pretreatment. Finally, the rigid and flexible PSC devices based on the new SnO2 ETLs yield high PCEs of up to 20.5% and 17.5%, respectively.
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