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Predicting thermal stability of organic solar cells through an easy and fast capacitance measurement

Tessarolo, Marta and Guerrero, Antonio and Gedefaw, Desta and Bolognesi, Margherita and Prosa, Mario and Xu, Xiaofeng and Mansour, Mahdi and Wang, Ergang and Seri, Mirko and Andersson, Mats R. and Muccini, Michele and Garcia-Belmonte, Germà (2015) Predicting thermal stability of organic solar cells through an easy and fast capacitance measurement. Solar Energy Materials and Solar Cells, 141 . pp. 240-247. ISSN 0927-0248

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Degradation of organic photovoltaic (OPV) devices is currently a topic under intense research as it is one of the main limitations towards the commercialization of this technology. Morphological changes at both active layer and interfaces with the outer contacts are believed to determine main key issues to be overcome. In-line techniques are essential to rule out any effect arising during sample fabrication. Unfortunately, the number of physical techniques able to provide morphological information on complete and operational devices is certainly limited. In this work, we study the thermal degradation of bulk heterojunction (BHJ) solar cells composed by different donor polymers with techniques developed to provide in-situ information on operational devices. Capacitance measurement as a function of temperature monitors the electrical integrity of the active layer and provides the threshold temperature (TMAX) at which the whole device becomes thermally unstable. We found a direct correlation between the threshold temperature TMAX, obtained by capacitance–temperature measurements on complete OPV devices, and the power conversion efficiency decay measured at 85 °C. Devices tend to be thermally stable when the temperature of the thermal stress is below TMAX, while above TMAX evident changes in the active layer or at the active layer/electrode interface are also detected by confocal fluorescence microscopy. The capacitance method gives precious guidelines to predict the thermal stability of BHJ solar cells using an accelerated and easy test.

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Generic Email
Date Deposited: 29 Aug 2018 02:18
Last Modified: 29 Aug 2018 02:18

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