Journal
ENERGY TECHNOLOGY
Volume 8, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202000295
Keywords
organic solar cells; scalable fabrication; transient photovoltage
Categories
Funding
- Interreg Deutschland-Danmark
- European Regional Development Fund
- Southern Denmark Growth Forum
- Villum Foundation [13365]
- Danmarks Frie Forskningsfond, DFF FTP [8022-00389B]
- EU Framework Programme Horizon 2020 [MP1307]
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The development of nonfullerene acceptors (NFAs) has led to dramatic improvements in the device efficiencies of organic photovoltaic (OPV) cells. To date it is, however, still unclear how those laboratory-scale efficiencies transfer to commercial modules, and how stable these devices will be when processed via industrially compatible methods. Herein, the degradation behavior of lab-scale and scalable OPV devices using similar nonfullerene-based active layers is assessed. It is demonstrated that the scalable NFA OPV exhibits completely reversible degradation when assessed in ISOS-O-1 outdoor conditions, which is in contrast to the laboratory-scale devices assessed via the indoor ISOS-L-2 protocol. Results from transient photovoltage (TPV) indicate the presence of charge trap formation, and a number of potential mechanisms are proposed for the selective occurrence of this in laboratory-scale devices tested in ISOS-L laboratory conditions-ultimately concluding that it has its origins in the different device architectures used. The study points at the risk of assessing active layer stability from laboratory-scale devices and degradation studies alone and highlights the importance of using a diverse range of testing conditions and ISOS protocols for such assessment.
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