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Progress in Understanding Degradation Mechanisms and Improving Stability in Organic Photovoltaics

Progress in Understanding Degradation Mechanisms and Improving Stability in Organic Photovoltaics Understanding the degradation mechanisms of organic photovoltaics is particularly important, as they tend to degrade faster than their inorganic counterparts, such as silicon and cadmium telluride. An overview is provided here of the main degradation mechanisms that researchers have identified so far that cause extrinsic degradation from oxygen and water, intrinsic degradation in the dark, and photo‐induced burn‐in. In addition, it provides methods for researchers to identify these mechanisms in new materials and device structures to screen them more quickly for promising long‐term performance. These general strategies will likely be helpful in other photovoltaic technologies that suffer from insufficient stability, such as perovskite solar cells. Finally, the most promising lifetime results are highlighted and recommendations to improve long‐term performance are made. To prevent degradation from oxygen and water for sufficiently long time periods, OPVs will likely need to be encapsulated by barrier materials with lower permeation rates of oxygen and water than typical flexible substrate materials. To improve stability at operating temperatures, materials will likely require glass transition temperatures above 100 °C. Methods to prevent photo‐induced burn‐in are least understood, but recent research indicates that using pure materials with dense and ordered film morphologies can reduce the burn‐in effect. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Materials Wiley

Progress in Understanding Degradation Mechanisms and Improving Stability in Organic Photovoltaics

Mateker, William R.; McGehee, Michael D.
Advanced Materials , Volume 29 (10) – Mar 1, 2017
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References (196)

Publisher
Wiley
Copyright
© 2017 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
0935-9648
eISSN
1521-4095
DOI
10.1002/adma.201603940
pmid
28004854
Publisher site
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Abstract

Understanding the degradation mechanisms of organic photovoltaics is particularly important, as they tend to degrade faster than their inorganic counterparts, such as silicon and cadmium telluride. An overview is provided here of the main degradation mechanisms that researchers have identified so far that cause extrinsic degradation from oxygen and water, intrinsic degradation in the dark, and photo‐induced burn‐in. In addition, it provides methods for researchers to identify these mechanisms in new materials and device structures to screen them more quickly for promising long‐term performance. These general strategies will likely be helpful in other photovoltaic technologies that suffer from insufficient stability, such as perovskite solar cells. Finally, the most promising lifetime results are highlighted and recommendations to improve long‐term performance are made. To prevent degradation from oxygen and water for sufficiently long time periods, OPVs will likely need to be encapsulated by barrier materials with lower permeation rates of oxygen and water than typical flexible substrate materials. To improve stability at operating temperatures, materials will likely require glass transition temperatures above 100 °C. Methods to prevent photo‐induced burn‐in are least understood, but recent research indicates that using pure materials with dense and ordered film morphologies can reduce the burn‐in effect.

Journal

Advanced Materials – Wiley

Published: Mar 1, 2017

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