期刊
ADVANCED MATERIALS
卷 31, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201902222
关键词
build-in field; perovskite solar cells; polarized ferroelectric polymers
类别
资金
- Natural Science Foundation of China [91733301, 61674109]
- National Key R&D Program of China [2016YFA0202400]
- Natural Science Foundation of Jiangsu Province [BK20170059]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2018KF07]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of The State Administration of Foreign Experts Affairs of China
In hybrid organic-inorganic lead halide perovskite solar cells, the energy loss is strongly associated with nonradiative recombination in the perovskite layer and at the cell interfaces. Here, a simple but effective strategy is developed to improve the cell performance of perovskite solar cells via the combination of internal doping by a ferroelectric polymer and external control by an electric field. A group of polarized ferroelectric (PFE) polymers are doped into the methylammonium lead iodide (MAPbI(3)) layer and/or inserted between the perovskite and the hole-transporting layers to enhance the build-in field (BIF), improve the crystallization of MAPbI(3), and regulate the nonradiative recombination in perovskite solar cells. The PFE polymer-doped MAPbI(3) shows an orderly arrangement of MA(+) cations, resulting in a preferred growth orientation of polycrystalline perovskite films with reduced trap states. In addition, the BIF is enhanced by the widened depletion region in the device. As an interfacial dipole layer, the PFE polymer plays a critical role in increasing the BIF. This combined effect leads to a substantial reduction in voltage loss of 0.14 V due to the efficient suppression of nonradiative recombination. Consequently, the resulting perovskite solar cells present a power conversion efficiency of 21.38% with a high open-circuit voltage of 1.14 V.
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