Enhanced performance of mesostructured perovskite solar cells with a composite Sn4+-doped TiO2 electron transport layer
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Recently, perovskite solar cells (PSCs) have attracted more attention. TiO2 as the most common electron transfer material in PSCs has been improved by a serious of methods. In this study, a simple method was used to improve the traditional compact TiO2 properties by doping with Sn4+. It demonstrated that the conductivity of the TiO2 film could be well improved and the band-gap shifted from 3.65 to 3.55 eV with the introduction of Sn ions. The Sn–O–Ti bond was observed in the Sn:TiO2 film according to the results of XPS. The mesostructured PSCs based on Sn:TiO2 exhibited negligible J-V hysteresis behavior, and the Jsc of the device increased distinctly. The power conversion efficiency (PCE) of the Sn:TiO2 device was improved from 14.86 to 17.11%, compared with the reference device.
KeywordsSn-doping TiO2 Electron transfer layers Less hysteresis Mesostructured
This work was supported by the National Natural Science Foundation of China (No. U1302274 and 51674026) and the Fundamental Research Funds for the Central Universities (230201606500078).
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