Strong Photocurrent from Two-Dimensional Excitons in Solution-Processed Stacked Perovskite Semiconductor Sheets
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Authors
Ahmad, Shahab
Kanaujia, PK
Beeson, HJ
Abate, A
Steiner, U
Prakash, GV
Publication Date
2015-11-18Journal Title
ACS Applied Materials and Interfaces
ISSN
1944-8244
Publisher
American Chemical Society
Volume
7
Issue
45
Pages
25227-25236
Language
English
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Ahmad, S., Kanaujia, P., Beeson, H., Abate, A., Deschler, F., Credgington, D., Steiner, U., et al. (2015). Strong Photocurrent from Two-Dimensional Excitons in Solution-Processed Stacked Perovskite Semiconductor Sheets. ACS Applied Materials and Interfaces, 7 (45), 25227-25236. https://doi.org/10.1021/acsami.5b07026
Abstract
Room-temperature photocurrent measurements in two-dimensional (2D) inorganic-organic perovskite devices reveal that excitons strongly contribute to the photocurrents despite possessing binding energies over 10 times larger than the thermal energies. The p-type (C₆H₉C₂H₄NH₃)₂PbI₄ liberates photocarriers at metallic Schottky aluminum contacts, but incorporating electron- and hole-transport layers enhances the extracted photocurrents by 100-fold. A further 10-fold gain is found when TiO₂ nanoparticles are directly integrated into the perovskite layers, although the 2D exciton semiconducting layers are not significantly disrupted. These results show that strong excitonic materials may be useful as photovoltaic materials despite high exciton binding energies and suggest mechanisms to better understand the photovoltaic properties of the related three-dimensional perovskites.
Keywords
exciton photocurrent, inorganic−organic hybrid, layered perovskite, photodetector, room-temperature exciton
Sponsorship
This work was supported by EPSRC Grants EP/K028510/1, EP/G060649/1, EP/G037221/1, EP/H007024/1, EP/L027151/1, and EP/L015978/1, the Cambridge NanoDTC, and ERC LINASS 320503.
Funder references
EPSRC (EP/G060649/1)
EPSRC (EP/K028510/1)
EPSRC (EP/L027151/1)
European Research Council (320503)
EPSRC (EP/H007024/1)
EPSRC (EP/G037221/1)
EPSRC (EP/L015978/1)
Identifiers
External DOI: https://doi.org/10.1021/acsami.5b07026
This record's URL: https://www.repository.cam.ac.uk/handle/1810/263439
Rights
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International