Propelling efficiency and stability of planar perovskite solar cells via Al2O3 interface modification to compact TiO2 layer
Organic Electronics(2017)
摘要
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 Al-TiO2/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.
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关键词
Planar perovskite solar cells (p-PSCs),Al-TiO2,Carrier recombination,Oxygen vacancy,Al-TiO2/CH3NH3PbI3-xClx interface
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