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@article{Westbrook:2021:10.1021/acs.jpclett.1c00362,
author = {Westbrook, RJE and Xu, W and Liang, X and Webb, T and Clarke, TM and Haque, SA},
doi = {10.1021/acs.jpclett.1c00362},
journal = {Journal of Physical Chemistry Letters},
pages = {3312--3320},
title = {2D phase purity determines charge-transfer yield at 3D/2D lead halide perovskite heterojunctions},
url = {http://dx.doi.org/10.1021/acs.jpclett.1c00362},
volume = {12},
year = {2021}
}

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TY  - JOUR
AB  - Targeted functionalization of 3D perovskite with a 2D passivation layer via R-NH3I treatment has emerged as an effective strategy for enhancing both the efficiency and chemical stability of ABX3 perovskite solar cells, but the underlying mechanisms behind these improvements remain unclear. Here, we assign a passivation mechanism where R-NH3I reacts with excess PbI2 in the MAPbI3 film and unsaturated PbI6 octahedra to form (R-NH3)2(MA)n-1PbnI3n+1. Crucially, we show that precise control of the 2D (R-NH3)2(MA)n-1PbnI3n+1 layer underpins performance improvements: n = 1 yields over a 2-fold improvement in hole injection to the HTL; n > 1 deteriorates hole injection. Ultrafast transient absorption spectroscopy suggests this n-dependence is rooted in the fact that fast (<6 ns) hole injection does not occur between the 3D and 2D layers. These results help explain contemporary empirical findings in the field and set out an important design rule for the further optimization of multidimensional perovskite optoelectronics.
AU  - Westbrook,RJE
AU  - Xu,W
AU  - Liang,X
AU  - Webb,T
AU  - Clarke,TM
AU  - Haque,SA
DO  - 10.1021/acs.jpclett.1c00362
EP  - 3320
PY  - 2021///
SN  - 1948-7185
SP  - 3312
TI  - 2D phase purity determines charge-transfer yield at 3D/2D lead halide perovskite heterojunctions
T2  - Journal of Physical Chemistry Letters
UR  - http://dx.doi.org/10.1021/acs.jpclett.1c00362
UR  - https://www.ncbi.nlm.nih.gov/pubmed/33769059
UR  - http://hdl.handle.net/10044/1/87461
VL  - 12
ER  -

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