The Controlling Mechanism for Potential Loss in CH3NH3PbBr3 Hybrid Solar Cells

We investigated moisture and thermal stability of MAPbBr3 perovskite material. Cubic MAPbBr3 was found to be moisture-insensitive and can avoid the thermal stability issues introduced by low-temperature phase transition in MAPbI3. MAPbBr3 and MAPbI3 hybrid solar cells with efficiencies of ∼7.1% and...

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Bibliographic Details
Published in:ACS energy letters 2016-08, Vol.1 (2), p.424-430
Main Authors: Zheng, Xiaojia, Chen, Bo, Yang, Mengjin, Wu, Congcong, Orler, Bruce, Moore, Robert B, Zhu, Kai, Priya, Shashank
Format: Article
Language:English
Subjects:
activation energy
interface recombination
MATERIALS SCIENCE
perovskite solar cell
potential loss
SOLAR ENERGY
transition temperature
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Summary:We investigated moisture and thermal stability of MAPbBr3 perovskite material. Cubic MAPbBr3 was found to be moisture-insensitive and can avoid the thermal stability issues introduced by low-temperature phase transition in MAPbI3. MAPbBr3 and MAPbI3 hybrid solar cells with efficiencies of ∼7.1% and ∼15.5%, respectively, were fabricated, and we identified the correlation between the working temperature, light intensity, and the photovoltaic performance. No charge-carrier transport barriers were found in the MAPbBr3 and MAPbI3 solar cells. The MAPbBr3 solar cell displays a better stability under high working temperature because of its close-packed crystal structure. Temperature-dependent photocurrent–voltage characteristics indicate that, unlike the MAPbI3 solar cell with an activation energy (E A) nearly equal to its band gap (E g), the E A for the MAPbBr3 solar cell is much lower than its E g. This indicates that a high interface recombination process limits the photovoltage and consequently the device performance of the MAPbBr3 solar cell.
ISSN:2380-8195
2380-8195
DOI:10.1021/acsenergylett.6b00215