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The Effect of Interfacial Energetics on Charge Transfer from Lead Halide Perovskite to Organic Hole Conductors
File(s)
acs.jpcc.7b09178.pdf (1.84 MB)
Published version
Author(s)
Westbrook, RJE
Haque, Saif
Sanchez-Molina, Irene
Marin-Beloqui, Jose Manuel
Bronstein, Hugo
Type
Journal Article
Abstract
The control and optimization of interfacial charge transfer processes is crucial to the design of efficient perovskite solar cells. Herein, we measure the yield and kinetics of hole transfer across the methylammonium lead triiodide perovskite|polymeric hole transport material heterojunction, as a function of the interfacial energy offset, ∆E between the highest occupied molecular orbital of the hole transport material and the valence band of the perovskite. A combination of steady-state and time-resolved photoluminescence, along with transient absorption spectroscopy revealed that only a small driving energy (∆E~0.07eV) is required to induce highly efficient hole transfer. The findings of this paper suggest that further improvements in the open-circuit voltage, and so the power conversion efficiency, of perovskite solar cells could be achieved by incorporating hole transport materials that provide an interfacial energy offset in the range 0 < ∆E < 0.18eV.
Date Issued
2018-01-05
Date Acceptance
2017-12-05
Citation
Journal of Physical Chemistry C, 2018, 122 (2), pp.1326-1332
URI
DOI
ISSN
1932-7447
Publisher
American Chemical Society
Start Page
1326
End Page
1332
Journal / Book Title
Journal of Physical Chemistry C
Volume
122
Issue
2
Copyright Statement
This is an open access article published under an ACS AuthorChoice License, which permits
copying and redistribution of the article or any adaptations for non-commercial purposes.
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Grant Number
EP/K010298/1
EP/M023532/1
Subjects
09 Engineering
03 Chemical Sciences
10 Technology
Physical Chemistry
Publication Status
Published