Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.253
Publication date: 7th February 2022
Polymer solar cells (PSCs) are a promising candidate as a future photovoltaic technology due to their lightweight, flexible and solution processable features. Development of non-fullerene acceptors (NFAs) allows significantly improved power conversion efficiencies (PCEs) of PSCs over 18% with their stronger light absorption properties and a wider absorption ranges than the fullerene acceptors. However, achieving highly efficient and highly stable PSCs is still challenging due to intrinsic disadvantages in the NFA based PSCs such as photochemically active molecular moiety in the photoactive materials and poor miscibility of donor and acceptor. Besides the features of the photoactive layer, interfacial layers are also critical to determine the stability of PSCs. Zinc oxide (ZnO) has been widely employed as an electron transport layer (ETL) in the inverted device structure because of their transparency in the visible spectral range, good electronic conductivity and solution processability. However, ZnO shows strong photocatalytic activity under illumination with UV light and induces the decomposition at the ETL/photoactive layer interface. In this work, we introduce an effective strategy to improve stability at the ZnO/photoactive layer interface by adding fullerene-based self-assembled monolayer(C60-SAM) in the photoactive layer as an additive. It is found that the C60-SAM in the photoactive layer can be spontaneously formed at the surfaces of the ZnO during spin-coating process due to the carboxylic acid group in the C60-SAM. PSCs without and with C60-SAM were fabricated and the devices with C60-SAM show efficiency enhancements of ~4-14% compared to the PSCs without C60-SAM additive. Furthermore, PCE drops of PSCs with C60-SAM are improved of ~26-30% under 1 sun illumination. The C60-SAM in the photoactive layer acts multiple functions to improve the molecular ordering of the photoactive materials and to decrease the photo bleaching rate of the photoactive materials by UV light.
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