Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.171
Publication date: 23rd September 2021
Organic semiconductors have attracted tremendous attention in the past few years, thanks to their excellent flexibility, solution-processability, low-cost and chemical versatility. In particular, organic photodetectors (OPDs) have demonstrated state-of-the-art device performance [1,2]. More recently, photomultiplication-type OPDs have merged as promising candidates for next-generation solution-processed photodetectors, thanks to the ultrahigh responsivity and low-dark current and noise. [3] However, this photomultiplication effect was mainly characterized with enhanced device performance, the underlying mechanism was attributed to the trap-mediated charge transport, and lacks of detail analysis. In this work, we characterized the devices with multiple transient techniques; the charge transport and accumulation of photo-generated carriers were fully analyzed, and we found that ultra-long carrier lifetime and imbalanced charge transport are required for the photomultiplication process.
The financially supports from the National Natural Science Foundation of China (Grant No. 61875154), Science and Technology Department of Hubei Province (Grant No. 2018CFA021, No. 2019AAA020) are gratefully acknowledged.
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