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Issue 7, 2017
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Transition metal-substituted lead halide perovskite absorbers

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Lead halide perovskites have proven to be a versatile class of visible light absorbers that allow rapid access to the long minority carrier lifetimes and diffusion lengths desirable for traditional single-junction photovoltaics. We explore the extent to which the attractive features of these semiconductors may be extended to include an intermediate density of states for future application in multi-level solar energy conversion systems capable of exceeding the Shockley–Queisser limit. We computationally and experimentally explore the substitution of transition metals on the Pb site of MAPbX3 (MA = methylammonium, X = Br or Cl) to achieve a tunable density of states within the parent gap. Computational screening identified both Fe- and Co-substituted MAPbBr3 as promising absorbers with a mid-gap density of states, and the later films were synthesized via conventional solution-based processing techniques. First-principles density functional theory (DFT) calculations support the existence of mid-gap states upon Co incorporation and enhanced sub-gap absorption, which are consistent with UV-visible-NIR absorption spectroscopy. Strikingly, steady state and time-resolved PL studies reveal no sign of self-quenching for Co-substitution up to 25%, which suggest this class of materials to be a worthy candidate for future application in intermediate band photovoltaics.

Graphical abstract: Transition metal-substituted lead halide perovskite absorbers

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The article was received on 10 Nov 2016, accepted on 05 Jan 2017 and first published on 27 Jan 2017

Article type: Paper
DOI: 10.1039/C6TA09745F
J. Mater. Chem. A, 2017,5, 3578-3588

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    Transition metal-substituted lead halide perovskite absorbers

    M. D. Sampson, J. S. Park, R. D. Schaller, M. K. Y. Chan and A. B. F. Martinson, J. Mater. Chem. A, 2017, 5, 3578
    DOI: 10.1039/C6TA09745F

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