Small-molecular donor guest achieves rigid 18.5% and flexible 15.9% efficiency organic photovoltaic via fine-tuning microstructure morphology

Recent progress in all-small-molecule organic photovoltaics

“…The ternary strategy has been veried as an effective and simple device structure optimization strategy, which has the potential in enhancing photon harvesting, optimizing molecular arrangement and phase separation, decreasing energy loss and improving device stability. [49][50][51][52] Ternary SMPVs have achieved impressive progress, such as the 16.28% PCE of B1:BO-4Cl:Y7 based SMPVs reported by An et al 53 and the 17.0% PCE of B1:BO-4Cl:BO-2Cl based SMPVs reported by Hou and co-workers. 32 In this review, the recent development of SMPVs are systemically introduced and discussed from donor material innovation and device engineering aspects.…”

Effect of side chain length on photovoltaic performance of fused-ring electron acceptors

“…有机太阳能电池具有重量轻、柔性、半透明、可大面积印刷制备等特点 [1][2][3][4][5] ，近年来被研究人员和工 业界广泛关注。有机太阳能电池的活性层一般由电子给体和电子受体材料共混制备而成。就电子受体材 料而言，在过去三十年间，富勒烯衍生物由于具有良好的电荷传输性能，长期占据着受体材料的主导地 位。然而富勒烯衍生物能级难以调控，可见光区吸收弱，易聚集，形貌不稳定，能量损失大等问题，限 制了有机太阳能电池效率和稳定性的提升，基于富勒烯受体的有机太阳能电池器件最高效率只有 12%左 右 [6,7] 。因此，研究人员着眼于非富勒烯受体的开发 [8.9] 。 自从 2015 年占肖卫课题组率先报道了以明星分子 ITIC 为代表的稠环电子受体以来 [10,11] ，稠环电子受 体材料发展迅猛，其有机太阳能电池效率不断被刷新，目前超过 18% [12][13][14][15][16][17] 。稠环电子受体可以通过模块 化的分子设计精确调节材料的能级和带隙，在近红外区具有很强的吸收，迁移率高，稳定性好，能量损 失小等优点，成为有机太阳能电池领域的研究热点 [18][19][20][21][22][23][24][25][26][27][28] 。 在有机太阳能电池给体材料中，侧链长度对材料的溶解性、吸收、能级、迁移率、活性层形貌等都 有影响，进一步影响着器件效率 [29][30][31] 。研究人员对稠环电子受体分子的稠核 [32][33][34] 、端基 [35][36][37][38] 和侧链 [39][40][41][42][43][44][45] [46][47] 用 SCLC 法(图 S7)测量 J71: ITIC 系列共混膜的空穴迁移率(μh)和电子迁移率(μe)，μh 在 6.5 × 10 -5 cm 2 V -1 s -1 ~ 13.3 × 10 -5 cm 2 V -1 s -1 之间，μe 在 4.6 × 10 -5 cm 2 V -1 s -1 ~ 8.8 × 10 -5 cm 2 V -1 s -1 之间，μh/μe 值 在 0.…”

Stable dinitrile end-capped closed-shell non-quinodimethane as a donor, an acceptor and an additive for organic solar cells

“…35 By selecting an appropriate third component, PCEs more than 18% have been reported for efficient ternary OSCs, which indicates tremendous potential for development. 36–42…”