期刊
ACS ENERGY LETTERS
卷 4, 期 11, 页码 2571-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b01920
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资金
- National Key Research Projects [2016YFA0202402]
- National Natural Science Foundation of China [51803144, 51761145013, 61674111]
- 111 projects
We developed lead halide perovskite quantum dot (QD) solar cells with a combinational absorbing layer based on stacked alpha-CsPbI3 and FAPbI(3). alpha-CsPbI3 QDs, with a relatively wide bandgap of 1.75 eV, are not ideal for single-junction solar cells. We show that the absorption can be broadened by the introduction of another QD layer with a narrower bandgap like FAPbI(3). The alpha-CsPbI3/FAPI(3) structure together with thermal annealing can improve the electrical coupling in the FAPbI(3) layer and induce A-site cation exchange to develop a graded heterojunction for more efficient charge extraction. A highest power conversion efficiency of 15.6% and improved ambient stability have been achieved for the bilayer structured solar cells. More interestingly, the perovskite QDs provided a facile way to fabricate multiple layers and quantum junctions for optoelectronic applications via layer-by-layer deposition, which cannot be realized in solution-processed perovskite thin-film devices.
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