Journal
RSC ADVANCES
Volume 8, Issue 37, Pages 20982-20989Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra03559h
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Funding
- Anshan Hifichem Co. Ltd.
- National Natural Science Foundation of China [21773128]
- Key Research and Development Projects of Sichuan Province [2017GZ0052]
- National Postdoctoral Program for Innovative Talents [BX201600138]
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Planar-structured perovskite solar cells (PSCs) have received tremendous attention due to their high power conversion efficiency (PCE), simple process and low-cost fabrication. A compact thin film of electron transport materials (ETMs) plays a key role in these PSCs. However, the traditional ETMs of PSCs, TiO2 nanoparticulate films, suffer from low conductivity and high trap state density. Herein, we exploited TiO2 nanospindles as a compact ETM in planar PSCs for the first time, and achieved an efficient device with a PCE of 19.1%. By optimization with Nb doping into the TiO2 nanospindles, the PCE of the PSC was further improved up to 20.8%. The carrier transfer and collection efficiency were significantly improved after Nb5+ doping, revealed by Mott-Schottky (MS) analysis, space charge limited current (SCLC), photoluminence (PL), time-resolved photoluminence (TRPL) spectra, electrochemical impedance spectra (EIS) and so forth. Moreover, the hysteresis behavior was effectively inhibited and the stability was significantly enhanced. This work may provide a new avenue towards the rational design of efficient ETMs for perovskite solar cells.
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