Intraphase microstructure-understanding the impact on organic solar cell performance

Scholes F.H., Ehlig T., James M., Lee K.H., Duffy N., Scully A.D., Singh T.B., Winzenberg K.N., Kemppinen P. and Watkins S.E. (2013) Intraphase microstructure-understanding the impact on organic solar cell performance. Advanced Functional Materials, 23 45: 5655-5662. doi:10.1002/adfm.201300726

Author Scholes F.H.
Ehlig T.
James M.
Lee K.H.
Duffy N.
Scully A.D.
Singh T.B.
Winzenberg K.N.
Kemppinen P.
Watkins S.E.
Title Intraphase microstructure-understanding the impact on organic solar cell performance
Journal name Advanced Functional Materials   Check publisher's open access policy
ISSN 1616-301X
Publication date 2013-12-01
Year available 2013
Sub-type Article (original research)
DOI 10.1002/adfm.201300726
Open Access Status Not Open Access
Volume 23
Issue 45
Start page 5655
End page 5662
Total pages 8
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Language eng
Formatted abstract
A comprehensive study of the effect of intraphase microstructure on organic photovoltaic (OPV) device performance is undertaken. Utilizing a bilayer device architecture, a small molecule donor (TIPS-DBC) is deposited by both spin-coating and by thermal evaporation in vacuum. The devices are then completed by thermal evaporation of C60, an exciton blocking layer and the cathode. This bilayer approach enables a direct comparison of device performance for donor layers in which the same material exhibits subtle differences in microstructure. The electrical performance is shown to differ considerably for the two devices. The bulk and interfacial properties of the donor layers are compared by examination with photoelectron spectroscopy in air (PESA), optical absorption spectroscopy, charge extraction of photo-generated charge carriers by linearly increasing voltage (photo-CELIV), time-resolved photoluminescence measurements, X-ray reflectometry (XR), and analysis of dark current behavior. The observed differences in device performance are shown to be influenced by changes to energy levels and charge transport properties resulting from differences in the microstructure of the donor layers. Importantly, this work demonstrates that in addition to the donor/acceptor microstructure, the intraphase microstructure can influence critical parameters and can therefore have a significant impact on OPV performance. The influence of intraphase microstructure on the performance of organic photovoltaics (OPVs) is studied utilizing a bilayer (planar heterojunction) device architecture. Devices in which the donor layer exhibits subtle differences in microstructure are compared, and these differences are shown to affect critical parameters (energy levels, charge transport properties) having a significant impact on performance.
Keyword bilayers
organic photovoltaics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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