An Pyeongje, Kim Jae Ho, Shin Myeonghwan, Kim Sukyeong, Cho Sungok, Park Chaehyun, Kim Geonguk, Lee Hyung Woo, Choi Jin Woo, Ahn Chuljin, Song Myungkwan
Department of Energy & Electronic Materials, Korea Institute of Materials Science (KIMS), Changwon 51508, Korea.
Department of Nano Fusion Technology, Pusan National University, Busan 46241, Korea.
Nanomaterials (Basel). 2022 Jul 5;12(13):2309. doi: 10.3390/nano12132309.
Fiber-shaped dye-sensitized solar cells (FDSSCs) with flexibility, weavablity, and wearability have attracted intense scientific interest and development in recent years due to their low cost, simple fabrication, and environmentally friendly operation. Since the Grätzel group used the organic radical 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) as the redox system in dye-sensitized solar cells (DSSCs) in 2008, TEMPO has been utilized as an electrolyte to further improve power conversion efficiency (PCE) of solar cells. Hence, the TEMPO with high catalyst oxidant characteristics was developed as a hybrid solid-state electrolyte having high conductivity and stability structure by being integrated with a lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) film for FDSSCs. The optimized 4-Oxo TEMPO (OX) based solid-state FDSSC (SS-FDSSC) showed the PCE of up to 6%, which was improved by 34.2% compared to that of the reference device with 4.47%. The OX-enhanced SS-FDSSCs reduced a series resistance () resulting in effective electron extraction with improved short-circuit current density (), while increasing a shunt resistance () to prevent the recombination of photo-excited electrons. The result is an improvement in a fill factor (FF) and consequently a higher value for the PCE.
近年来，具有柔韧性、可编织性和可穿戴性的纤维状染料敏化太阳能电池（FDSSC）因其低成本、制备简单和操作环保而引起了科学界的广泛关注和发展。自2008年格拉策尔团队在染料敏化太阳能电池（DSSC）中使用有机自由基2,2,6,6-四甲基-1-哌啶氧基（TEMPO）作为氧化还原体系以来，TEMPO已被用作电解质以进一步提高太阳能电池的功率转换效率（PCE）。因此，通过与用于FDSSC的双（三氟甲磺酰）亚胺锂（Li-TFSI）薄膜集成，开发出了具有高催化剂氧化特性的TEMPO作为具有高导电性和稳定结构的混合固态电解质。优化后的基于4-氧代TEMPO（OX）的固态FDSSC（SS-FDSSC）的PCE高达6%，与参考器件4.47%相比提高了34.2%。OX增强的SS-FDSSC降低了串联电阻（），从而有效提取电子，提高了短路电流密度（），同时增加了并联电阻（）以防止光激发电子的复合。结果是填充因子（FF）得到改善，从而PCE值更高。
