The Controlling Mechanism for Potential Loss in CH3NH3PbBr3 Hybrid Solar Cells

Xiaojia Zheng, Bo Chen, Mengjin Yang, Congcong Wu, Bruce Orler, Robert B. Moore, Kai Zhu, Shashank Priya

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

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 (EA) nearly equal to its band gap (Eg), the EA for the MAPbBr3 solar cell is much lower than its Eg. This indicates that a high interface recombination process limits the photovoltage and consequently the device performance of the MAPbBr3 solar cell.

Original languageEnglish (US)
Pages (from-to)424-430
Number of pages7
JournalACS Energy Letters
Volume1
Issue number2
DOIs
StatePublished - Aug 12 2016
Externally publishedYes

Bibliographical note

Funding Information:
The authors acknowledge the financial support from the Institute of Critical Technology and Applied Science (ICTAS). S.P. and X.Z. also acknowledge the financial support from Office of Naval Research through the MURI program. The work at the National Renewable Energy Laboratory is supported by the U.S. Department of Energy under Contract No. DE-AC36-08-GO28308. K.Z. and M.Y. acknowledge the support by the hybrid perovskite solar cell program of the National Center for Photovoltaics funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office.

Publisher Copyright:
© 2016 American Chemical Society.

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