期刊
ORGANIC ELECTRONICS
卷 51, 期 -, 页码 249-256出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2017.08.027
关键词
Planar perovskite solar cells (p-PSCs); Al-TiO2; Carrier recombination; Oxygen vacancy; Al-TiO2/CH3NH3PbI3-xClx interface
资金
- National Natural Science Foundation of China [61504068]
An effective and facile surface optimization method is conducted by spin-coating the solution containing Al(NO3)(3) upon compact TiO2 (c-TiO2) electrode for enlarging the performance of planar perovskite solar cells (p-PSCs). Meanwhile, the influence of Al(NO3)(3) solution concentration on efficiency performance of p-PSCs is also carefully investigated. The study results highlight that a discrete Al2O3 film can be formed on c-TiO2 electrode to passivate superficial oxygen vacancies defects and create a pleasurable surface topography, alone with high optical transparency. As a consequence, the champion device based on the modified c-TiO2 (Al-TiO2) via spinning 0.7 wt% Al(NO3)(3) solution drastically yields an enhanced power conversion efficiency of 14.75% as well as enjoys superior device stability compared to its counterpart based on bare c-TiO2. Through a further analysis, the fact that Al-TiO2 can effectively augment the charge collection and abate charge recombination efficiency by the suppression of oxygen vacancy defects at AlTiO2/ CH3NH3PbI3-xClx interface than that of bare c-TiO2 without modification is unveiled. Those findings provide an insight into the correlation between p-PSCs performance and the microscopic characteristics of c-TiO2, and put forward an effective measure to further promote the performance of p-PSCs for their record efficiency. (C) 2017 Elsevier B.V. All rights reserved.
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