First-Principles Analysis of Radiative Recombination in Lead-Halide Perovskites
Journal Article
·
· ACS Energy Letters
- Univ. of California, Santa Barbara, CA (United States). Materials Dept.; Materials Department, University of California, Santa Barbara
- Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
- Univ. of California, Santa Barbara, CA (United States). Materials Dept.
Slow radiative recombination due to a slightly indirect band gap has been proposed to explain the high efficiency of lead-halide perovskite solar cells. In this work, we calculate the radiative recombination rate from first principles for the prototypical lead-halide perovskite, MAPbI3 (MA=CH3NH3). Since the structure is dynamic, with the MA molecule rotating even at room temperature, we determine the momentum mismatch between the band edges as a function of the orientation of the MA molecule. Our results demonstrate that the indirect nature of the band gap suppresses the radiative recombination rate by less than a factor of two, and that the radiative recombination coefficient is as high as in traditional direct-gap semiconductors. Our study provides a rigorous assessment of the radiative recombination mechanisms and their relation to the high efficiency of lead-halide perovskite solar cells, and will provide a sound basis for accurate modeling.
- Research Organization:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Contributing Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Grant/Contract Number:
- AC02-05CH11231; SC0010689
- OSTI ID:
- 1468978
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 3; ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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