Journal Article

IMPULSE-2024-00069

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermally‐Induced Degradation in PM6:Y6‐Based Bulk Heterojunction Organic Solar Cells

Alam, S. ; Aldosari, H. ; Petoukhoff, C. E. ; Váry, T. ; Althobaiti, W. ; Alqurashi, M. ; Tang, H. ; Khan, J. I. ; Nádaždy, V. ; Müller-Buschbaum, P.MLZ* ; Welch, G. C. ; Laquai, F.

2024
Wiley-VCH Weinheim

Please use a persistent id in citations: doi:10.1002/adfm.202308076

Abstract: Thermally induced degradation of organic photovoltaic devices hinders the commercialization of this emerging PV technology. Thus, a precise understanding of the origin of thermal device instability, as well as identifying strategies to circumvent degradation is of utmost importance. Here, it investigates thermally-induced degradation of state-of-the-art PBDB-T-2F (PM6):BTP (Y6) bulk heterojunction solar cells at different temperatures and reveal changes of their optical properties, photophysics, and morphology. The open-circuit voltage and fill factor of thermally degraded devices are limited by dissociation and charge collection efficiency differences, while the short-circuit current density is only slightly affected. Energy-resolved electrochemical impedance spectroscopy measurements reveal that thermally degraded samples exhibit a higher energy barrier for the charge-transfer state to charge-separated state conversion. Furthermore, the field dependence of charge generation, recombination, and extraction are studied by time-delayed collection field and transient photocurrent and photovoltage experiments, indicating significant bimolecular recombination limits device performance. Finally, coupled optical-electrical device simulations are conducted to fit the devices’ current-voltage characteristics, enabling us to find useful correlations between optical and electrical properties of the active layers and device performance parameters.

Keyword(s): Energy (1st) ; Chemistry (2nd) ; Materials Science (2nd) ; Industrial Application (2nd)

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Contributing Institute(s):

1. MLZ (MLZ)

Experiment(s):

1. No specific instrument

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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