Journal
CHEMSUSCHEM
Volume 11, Issue 9, Pages 1432-1437Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201800060
Keywords
charge extraction; electrode materials; perovskites; solar cells; work function
Funding
- National Natural Science Foundation of China [21503202, 61774139]
- Shandong Provincial Natural Science Foundation [JQ201714]
- Qingdao National Laboratory for Marine Science and Technology [QNLM201702]
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All-inorganic CsPbX3 (X = I, Br) perovskite solar cells are regarded as cost-effective and stable alternatives for next-generation photovoltaics. However, sluggish charge extraction at CsPbX3/charge-transporting material interfaces, which arises from large interfacial energy differences, have markedly limited the further enhancement of solar cell performance. In this work, the work function (WF) of the back electrode is tuned by doping alloyed PtNi nanowires in carbon ink to promote hole extraction from CsPbBr3 halides, while an intermediate energy by setting carbon quantum dots (CQDs) at TiO2/CsPbBr3 interface bridges electron transportation. The preliminary results demonstrate that the matching WFs and intermediate energy level markedly reduce charge recombination. A power conversion efficiency of 7.17% is achieved for the WF-tuned all-inorganic perovskite solar cell, in comparison with 6.10% for the pristine device, and this is further increased to 7.86% by simultaneously modifying with CQDs. The high efficiency and improved stability make WF-controlled all-inorganic perovskite solar cells promising to develop advanced photovoltaic platforms.
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