Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 47, 2015
Previous Article Next Article

Efficient hole transport layers with widely tunable work function for deep HOMO level organic solar cells

Author affiliations

Abstract

Hole transport layers (HTLs) with large work function (WF) tuning ability for good energy level alignment with deep highest occupied molecular orbital (HOMO) level donor materials are desirable for high-performance and high open-circuit voltage (VOC) organic solar cells (OSCs). Here, a novel low-temperature and solution-process approach to achieve WF tuning in HTLs is proposed. Specifically, the HTLs made from 2,3,4,5,6-pentafluorobenzylphosphonic acid (F5BnPA) incorporated graphene oxide (GO) and molybdenum oxide (MoOx) solution (representing two possible classes of HTLs where carriers transport via valence and conduction bands, respectively) offer continuous WF tuning (the tuning range as large as 0.81 eV) by controlling F5BnPA's concentration. By employing a deep HOMO donor material, OSCs using the composite HTLs can achieve improved performances with largely increased VOC (0.92 V for GO:F5BnPA versus 0.65 V for pristine GO; 0.91 V for MoOx:F5BnPA versus 0.88 V for pristine MoOx). The enhanced performance can be experimentally and theoretically explained by the decreased hole injection barrier (HIB) for GO or equivalent HIB (i.e. electron extraction barrier) for MoOx and enhanced surface recombination velocity, which contribute to eliminating S-shaped current–voltage characteristics. Consequently, the incorporation of F5BnPA can efficiently tune HTL WF for high VOC OSCs and extend HTL applications in organic electronics.

Graphical abstract: Efficient hole transport layers with widely tunable work function for deep HOMO level organic solar cells

Back to tab navigation

Supplementary files

Article information


Submitted
31 Aug 2015
Accepted
26 Oct 2015
First published
27 Oct 2015

J. Mater. Chem. A, 2015,3, 23955-23963
Article type
Paper
Author version available

Efficient hole transport layers with widely tunable work function for deep HOMO level organic solar cells

J. Cheng, F. Xie, Y. Liu, W. E. I. Sha, X. Li, Y. Yang and W. C. H. Choy, J. Mater. Chem. A, 2015, 3, 23955
DOI: 10.1039/C5TA06878A

Social activity

Search articles by author

Spotlight

Advertisements