期刊
NANO RESEARCH
卷 10, 期 11, 页码 3671-3679出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1577-4
关键词
surface states; TiO2 submicrospheres; solar cells; charge extraction methods; cyclic voltammetry
类别
资金
- National High-tech R&D Program of China [2015AA050602]
- External Cooperation Program of BIC, Chinese Academy of Sciences [GJHZ1607]
- National Natural Science Foundation of China [U1205112, 51572080, 21273242]
- Natural Science Foundation of Anhui Province [1508085SMF224]
Owing to their special three-dimensional network structure and high specific surface area, TiO2 submicrospheres have been widely used as electron conductors in photoanodes for solar cells. In recent years, utilization of TiO2 submicrospheres in solar cells has greatly boosted the photovoltaic performance. Inevitably, however, numerous surface states in the TiO2 network affect electron transport. In this work, the surface states in TiO2 submicrospheres were thoroughly investigated by charge extraction methods, and the results were confirmed by the cyclic voltammetry method. The results showed that ammonia can effectively reduce the number of surface states in TiO2 submicrospheres. Furthermore, in-depth characterizations indicate that ammonia shifts the conduction band toward a more positive potential and improves the interfacial charge transfer. Moreover, charge recombination is effectively prevented. Overall, the cell performance is essentially dependent on the effect of the surface states, which affects the electron transfer and recombination process.
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