Effects of constant voltage and constant current stress in PCBM:P3HT solar cells

Andrea Cester, Aldo Rizzo, A. Bazzega, N. Lago, J. Favaro, M. Barbato, N. Wrachien, Suren A. Gevorgyan, Michael Corazza, Frederik C Krebs

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The aimof this work is the investigation of forward and reverse bias stress effects, cell self-heating and annealing in roll coated organic solar cells with PCBM:P3HT active layer. In reverse bias stress cells show a constant degradation over time. In forward current stress cells alternate degradation and annealing phases, which are explained through the high power dissipation during the current stress, and the consequent self-heating. The high temperature is able to recover the cell performances at least until a critical temperature is reached. The degradation can be explained by the following mechanisms: the decrease of the net generation rate (due to formation of exciton quenching centres or the reduction of exciton separation rate); the formation of small leaky paths between anode and cathode, which reduces the total current extracted from the cell. The stress-induced damage can be recovered by thermal annealing at 120 °C. © 2015 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalMicroelectronics Reliability
Volume55
Pages (from-to)1795-1799
Number of pages5
ISSN0026-2714
DOIs
Publication statusPublished - 2015

Keywords

  • Organic photovoltaics
  • Polymeric solar cells

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