Journal
SOLAR RRL
Volume 2, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800055
Keywords
Lewis base; nonfullerene acceptor; surface defects passivation; perovskite solar cells
Funding
- Hong Kong Polytechnic University [1-ZE29]
- Research Grants Council of Hong Kong [15246816]
- National High Technology Research and Development Program of China [2015AA050601]
- National Natural Science Foundation of China [11674252, 61376013, 91433203]
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Organo-metal halide hybrid perovskites with mixed cations and halides have become promising photovoltaic materials, showing extraordinary optoelectronic properties and excellent device performance. Herein, an organic semiconducting nonfullerene acceptor (NFA) molecule IT-M is introduced as Lewis base to improve perovskite interfaces. This facile Lewis base-assisted strategy effectively enhances the electronic properties of Cs-0.05(MA(0.17)FA(0.83))(0.95)Pb(I0.83Br0.17)(3) thin films, passivates the perovskite surface defects and further boosts the performance of perovskite solar cells. With the reduced surface defects, this approach significantly enhances the charge transport properties and boosts the photogenerated photoluminescence lifetime from 1.46 to 2.20 mu s. As a result, the n-i-p planar perovskite solar cell champion efficiency reaches 20.5% with a high FF of 81%. Moreover, the Lewis base molecule IT-M can also passivate the under-coordinated lead ions and enhance the durability of perovskite PbI6 octahedra framework under an ambient environment with thermal stress and humidity. The results provide a simple while highly effective route of fabricating the high performance and stable planar perovskite solar cells.
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