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Title: Charge accumulation and hysteresis in perovskite-based solar cells : an electro-optical analysis
Authors: Wu, Bo
Fu, Kunwu
Yantara, Natalia
Xing, Guichuan
Sun, Shuangyong
Sum, Tze Chien
Mathews, Nripan
Keywords: DRNTU::Engineering::Materials::Energy materials
Issue Date: 2015
Source: Wu, B., Fu, K., Yantara, N., Xing, G., Sun, S., Sum, T. C., et al. (2015). Charge accumulation and hysteresis in perovskite-based solar cells : an electro-optical analysis. Advanced Energy Materials, 5(19).
Series/Report no.: Advanced energy materials
Abstract: Organic–inorganic hybrid perovskite solar cells based on CH3NH3PbI3 have achieved great success with efficiencies exceeding 20%. However, there are increasing concerns over some reported efficiencies as the cells are susceptible to current–voltage (I–V) hysteresis effects. It is therefore essential that the origins and mechanisms of the I–V hysteresis can clearly be understood to minimize or eradicate these hysteresis effects completely for reliable quantification. Here, a detailed electro-optical study is presented that indicates the hysteresis originates from lingering processes persisting from sub-second to tens of seconds. Photocurrent transients, photoluminescence, electroluminescence, quasi-steady state photoinduced absorption processes, and X-ray diffraction in the perovskite solar cell configuration have been monitored. The slow processes originate from the structural response of the CH3NH3PbI3 upon E-field application and/or charge accumulation, possibly involving methylammonium ions rotation/displacement and lattice distortion. The charge accumulation can arise from inefficient charge transfer at the perovskite interfaces, where it plays a pivotal role in the hysteresis. These findings underpin the significance of efficient charge transfer in reducing the hysteresis effects. Further improvements of CH3NH3PbI3-based perovskite solar cells are possible through careful surface engineering of existing TiO2 or through a judicious choice of alternative interfacial layers.
ISSN: 1614-6832
DOI: 10.1002/aenm.201500829
Rights: © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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