Four new donor‐acceptor‐acceptor’ (D‐A‐A’)‐configured donors, CPNT, DCPNT, CPNBT, and DCPNBT equipped with naphtho[1,2‐c:5,6‐c′]bis([1,2,5]‐thiadiazole) (NT) or naphtho[2,3‐c][1,2,5]thiadiazole (NBT) as the central acceptor (A) unit bridging triarylamine donor (D) and cyano or dicyanovinylene acceptor (A’), were synthesized and characterized. All molecules exhibit bathochromic absorption shifts as compared to those of the benzothiadiazole (BT)‐based analogues owing to improved electron‐withdrawing and quinoidal character of NT and NBT cores that lead to stronger intramolecular charge transfer. Favorable energy level alignments with C₇₀, together with the good thermal stability and the antiparallel dimeric packing render CPNT and DCPNT suitable donors for vacuum‐processed organic photovoltaics (OPV)s. OPVs based on DCPNT : C₇₀ active layers displayed the best power conversion efficiency (PCE)=8.3%, along with an open circuit voltage of 0.92 V, a short circuit current of 14.5 mA cm⁻² and a fill factor of 62% under 1 sun intensity, simulated AM1.5G illumination. Importantly, continuous light‐soaking with AM 1.5G illumination has verified the durability of the devices based on CPNT:C₇₀ and DCPNT : C₇₀ as the active blends. The devices were examined for their feasibility of indoor light harvesting under 500 lux illumination by a TLD‐840 fluorescent lamp, giving PCE=12.8% and 12.6%, respectively. These results indicate that the NT‐based D‐A‐A’‐type donors CPNT and DCPNT are potential candidates for high‐stability vacuum‐processed OPVs suitable for indoor energy harvesting.

中文翻译：

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新的DA-A'配置的小分子供体，利用共轭使光伏吸收发生红移。

四个新的供体-受体-受体'（d-A-A'） -配置的供体，CPNT，DCPNT，CPNBT和DCPNBT配备萘并[1,2 -c：5,6 -c' ]双（[1， 2,5]-噻二唑）（NT）或萘[2,3- c ] [1,2,5]噻二唑（NBT）作为中央受体（A）单元，桥接三芳基胺供体（D）和氰基或二氰基亚乙烯基受体（合成并表征。与基于苯并噻二唑（BT）的类似物相比，所有分子均表现出红移吸收位移，这是由于NT和NBT核的吸电子性和喹诺酮特性得到改善，从而导致更强的分子内电荷转移。能效等级与C _{70保持一致}与良好的热稳定性和反平行二聚体填料一起渲染CPNT和DCPNT用于真空处理的有机光伏器件（OPV），其适于供体S上。基于DCPNT的 OPV ：C ₇₀有源层的最佳功率转换效率（PCE）= 8.3％，开路电压为0.92 V，短路电流为14.5 mA cm ^-2，填充系数为62％ 1个阳光强度，模拟AM1.5G照明。重要的是，连续光与浸泡AM1.5G照度已经验证基于设备的耐久性CPNT：C ₇₀和DCPNT ：C ₇₀作为活性混合物。使用TLD-840荧光灯检查了这些设备在500 lux照明下收集室内光的可行性，其PCE分别为12.8％和12.6％。这些结果表明，基于NT-d-A-A'-型供体CPNT和DCPNT是适用于室内能量收集高稳定性的真空处理的OPV潜在候选。