This work describes the utilization of D-A-D type organic semiconductor, 4,4’-(benzo[c] [1,2,5]selenadiazole-4,7-diyl)bis(N,N-diphenylaniline), denoted as Se-2TPA, containing benzoselenadiazole (BSe) as acceptor core and end-capped with triphenylamine (TPA) donor units as donor materials in solar cells. Superlatively, the attachment of TPA donor moiety in BSe acceptor unit enlarged the conjugated system by extending the π-bonding which effectively tuned the optical and electrochemical properties of Se-2TPA. The bulk heterojunction organic solar cell (BHJ-OSCs) with configuration of ITO/cp-TiO₂/Se-2TPA:PC₆₁BM/Au showed power conversion efficiency (PCE) of ∼4.12% with short circuit current (Jsc) value of ∼11.28 mA/cm², open circuit voltage (Voc) of ∼0.775 V and fill factor (FF) of ∼0.48. PCE significantly increased from ∼4.12% to ∼5.29% when 1,8-diiodooctane (DIO) was added as an additive in Se-2TPA:PC₆₁BM blend which associated with less phase separation and improved the charge extraction. The fabricated BHJ-OSCs processed with 3% DIO, ITO/cp-TiO₂/Se-2TPA:PC₆₁BM/Au configuration displayed a long-term stability under air condition at an ambient temperature by maintaining ∼80% PCE for the duration of 30 days. The advantages of easy synthesis, low cost and promising cell performance supported Se-2TPA as successful organic semiconductor for BHJ-OSCs.

这项工作描述了 DAD 型有机半导体的利用，4,4'-(benzo[c] [1,2,5]selenadiazole-4,7-diyl)bis(N,N-diphenylaniline)，表示为 Se-2TPA ，含有苯并硒二唑（BSe）作为受体核，并用三苯胺（TPA）供体单元封端作为太阳能电池中的供体材料。最重要的是，TSe 受体单元中 TPA 供体部分的连接通过扩展 π 键扩大了共轭系统，有效地调整了 Se-2TPA 的光学和电化学性质。具有 ITO/cp-TiO ₂ /Se-2TPA:PC ₆₁ BM/Au配置的体异质结有机太阳能电池 ( BHJ-OSCs)显示出约 4.12% 的功率转换效率 (PCE)，短路电流 (Jsc) 值为～11.28 mA/cm ²，开路电压 (Voc) 为 ~0.775 V，填充因子 (FF) 为 ~0.48。当在 Se-2TPA:PC ₆₁ BM 混合物中添加 1,8-二碘辛烷 (DIO) 作为添加剂时，PCE 从~4.12% 显着增加到~5.29%，这与较少的相分离相关并改善了电荷提取。用 3% DIO、ITO/cp-TiO ₂ /Se-2TPA:PC ₆₁ BM/Au 配置处理的 BHJ-OSCs在空气条件下在环境温度下通过在持续时间内保持 80% 的 PCE 显示出长期稳定性30 天。易于合成、低成本和有前途的电池性能的优点支持 Se-2TPA 作为成功的 BHJ-OSC 有机半导体。