研究目的
Investigating the effects of non-fullerene acceptors (NFAs) on the long-term stability of polymer solar cells (PSCs) and determining the mechanism of degradation of ITIC-based solar cell devices under illumination.
研究成果
The study concludes that ITIC plays a key role in the photo-degradation of PSC performance despite its contribution to solar cell efficiency. The vinyl group in ITIC is photodegraded in the presence of ZnO at the active layer/ZnO interface, leading to reduced device stability. The findings emphasize the importance of designing NFAs with chemical structures composed of energetically stable aromatic structures and minimal chemically vulnerable functional groups for the realization of stable and high efficiency PSCs.
研究不足
The study focuses on the photo-stability of PSCs based on ITIC and does not extensively cover other NFAs. The degradation mechanism is primarily attributed to the photocatalytic reaction of ITIC in the presence of ZnO under illumination, but other factors may also contribute to the degradation.
1：Experimental Design and Method Selection
The study involved the fabrication of PSCs with the inverted cell architecture ITO/ZnO/active layer/MoO3/Ag containing a binary bulk heterojunction (BHJ) active layer blend of PBDB-T:ITIC or PTB7:PC71BM. The stabilities of the glass-encapsulated devices were tested under 1 sun light soaking.
2：Sample Selection and Data Sources
The optimized donor:acceptor ratios are 1:1 and 1:1.3 for the PBDB-T:ITIC and PTB7:PC71BM active films respectively. All solar cells were fabricated under identical optimized processing conditions.
3：List of Experimental Equipment and Materials
UV-vis absorption spectra were recorded before and after light soaking. Atomic force microscopy (AFM) topography images of the BHJ active films before and after light soaking were obtained. Time-resolved photoluminescence (TRPL) measurements of fresh and degraded ITIC on ZnO were performed.
4：Experimental Procedures and Operational Workflow
The current density–voltage (J–V) characteristics of the optimized PSCs for each binary blend under air mass global (AM 1.5G) simulated solar illumination were measured. The UV-vis absorption spectra of encapsulated ultra-thin BHJ active layer films and ITIC films on glass or ZnO with various 1 sun illumination times were monitored.
5：Data Analysis Methods
The data were analyzed to understand the effects of the ITIC acceptor on the photo-stability and degradation of these NFA-based PSC devices. The decomposition of ITIC was scrutinized by examining the photochemical reactions of the vinyl group-linked accepting unit of ITIC coated onto the ZnO film.
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