Revealing conflicting effects of solvent additives on morphology and performance of non-fullerene organic photovoltaics under different illuminance conditions
- Authors
- Kwon, Y[Kwon, Youngwoo]; Lee, CHY[Lee, Chihyung]; Nam, M[Nam, Minwoo]; Ko, DH[Ko, Doo-Hyun]
- Issue Date
- Nov-2022
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Organic photovoltaics; Non-fullerene acceptor; Solvent additive; Morphology; Low illuminance; Indoor power source
- Citation
- DYES AND PIGMENTS, v.207
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 207
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/101645
- DOI
- 10.1016/j.dyepig.2022.110754
- ISSN
- 0143-7208
- Abstract
- The use of solvent additives is effective for controlling the morphology and efficiency of non-fullerene bulk-heterojunction (BHJ) organic photovoltaics (OPVs) under both indoor and outdoor conditions. In this study, we examined the effects of solvent additives on the morphology and photovoltaic operation of non-fullerene OPVs under different illuminance conditions. Solvent additives (e.g., 1,8-diiodooctane) improved molecular packing and charge transport in non-fullerene BHJ layers, increasing the power conversion efficiency (PCE) under 1-sun illumination. However, incorporating the solvent additives promoted the formation of a crystallization-induced roughened surface and an isolated-non-fullerene domain in the intermixing region. These unexpected morpho-logical features increased the degree of trap-assisted charge recombination and leakage current, significantly reducing the PCE of non-fullerene OPVs at low light levels corresponding to indoor lighting. Understanding the effect of solvent additives inspires us to further control the morphological features of the non-fullerene OPVs by fine-tuning the solvent-additive concentration beyond the globally accepted level. This was effective for opti-mizing the indoor PCE of non-fullerene OPVs (21.71%), which exceeded that of the conventionally accepted reference (18.02%). This study provides guidelines for understanding the critical roles of solvent additives and optimizing the morphology of non-fullerene BHJs for high-performance indoor OPV applications.
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Collections - Graduate School > Chemistry > 1. Journal Articles
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