Jump to main content
Jump to site search

Issue 32, 2019
Previous Article Next Article

p-Doping of organic hole transport layers in p–i–n perovskite solar cells: correlating open-circuit voltage and photoluminescence quenching

Author affiliations

Abstract

Doping is a widely implemented strategy for enhancing the inherent electronic properties of charge transport layers in photovoltaic (PV) devices. Here, in direct contrast to existing understanding, we find that a reduction in p-doping of the organic hole transport layer (HTL) leads to substantial improvements in PV performance in planar p–i–n perovskite solar cells (PSCs), driven by improvements in open circuit voltage (VOC). Employing a range of transient and steady state characterisation tools, we find that the improvements of VOC correlate with reduced surface recombination losses in less p-doped HTLs. A simple device model including screening of bulk electric fields in the perovskite layer is used to explain this observation. In particular, photoluminescence (PL) emission of complete solar cells shows that efficient performance is correlated to a high PL intensity at open circuit and a low PL intensity at short circuit. We conclude that desirable transport layers for p–i–n PSCs should be charge selective contacts with low doping densities.

Graphical abstract: p-Doping of organic hole transport layers in p–i–n perovskite solar cells: correlating open-circuit voltage and photoluminescence quenching

Back to tab navigation

Supplementary files

Article information


Submitted
20 May 2019
Accepted
19 Jul 2019
First published
19 Jul 2019

J. Mater. Chem. A, 2019,7, 18971-18979
Article type
Paper

p-Doping of organic hole transport layers in p–i–n perovskite solar cells: correlating open-circuit voltage and photoluminescence quenching

T. Du, W. Xu, M. Daboczi, J. Kim, S. Xu, C. Lin, H. Kang, K. Lee, M. J. Heeney, J. Kim, J. R. Durrant and M. A. McLachlan, J. Mater. Chem. A, 2019, 7, 18971
DOI: 10.1039/C9TA03896E

Social activity

Search articles by author

Spotlight

Advertisements