Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 46, Issue -, Pages 202-207Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2019.11.004
Keywords
Perovskite solar cells; Hole transport; Interface passivation; Surface traps; Crystallinity
Funding
- National Natural Science Foundation of China [61875072]
- National Postdoctoral Program for Innovative Talents [BX20190135]
- Special Project of the Province-University Co-constructing Program of Jilin Province [SXGJXX2017-3]
- Project of Graduate Innovation Fund of Jilin University [101832018C018]
- International Cooperation and Exchange Project of Jilin Province [20170414002GH, 20180414001GH]
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NiO has a perfect-aligned energy level with CH3NH3PbI3 perovskite such that it serves as a hole transport layer (HTL), but NiO-based perovskite solar cells (PSCs) still suffer from low efficiency due to the poor interface contact between the perovskite layer and the NiO HTL, and haphazardly stacked perovskite grains. Herein, poly[(9,9 -dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-{2,1',3}-thiadiazole)] (PFBT) is introduced between the NiO and perovskite layers in the form of a polymer aggregate to enhance perovskite crystallinity and decrease the interface charge recombination between perovskite and NiO in PSCs, resulting in an improved performance. Moreover, PFBT modified perovskite films showed sharper, smoother, and more compact crystalline grains with fewer grain boundaries, leading to the decreased nonradiative recombination. This study offers a simple strategy to achieve highly efficient PSCs with the incorporation of polymer semiconductor aggregates to passivate the interface between the perovskite and NiO layers. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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