Flexible Organic solar cells (OSCs) have garnered widespread attention due to the increased popularity of wearable electronic devices. To enhance the efficiency and stability of the device we have prepared (2E,2′E)-3,3'-(4,4,9,9-tetrahexadecyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b'] dithiophene-2,7-diyl)bis(2-cyanoacrylic acid) (IDT) based dopant by reacting the aldehyde precursor with cyanoacetic acid in the presence of piperdine. Here, we investigate the effect of IDT on the performance of OSCs by adding IDT to star active layers PM6:Y6 and PM6:BTP-eC9 to improve OSCs' performance through morphology optimization. The addition of 5 wt% IDT significantly improved the device performance, achieving a remarkable PCE of 16.08 % for PM6:Y6 devices. The charge transport and recombination dynamics analysis showed that the appropriate concentration of IDT can provide better channels for carrier transport, promoting effective charge generation and extraction in OSCs. It is observed that the addition of IDT promotes effective generation and dissociation of excitons, thus improving OSC performance. The flexible ITO-free OSC was fabricated using PM6:Y6:IDT as the active layer film, achieving a high PCE of 12.59 % with VOC, JSC, and FF of 0.83 V, 23.21 mA/cm2 and 68.63 %, respectively. Hence, the findings indicate a reliable approach which could potentially deliver rigid and flexible OSCs with excellent performance and commercial viability.

中文翻译：

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使用新型固体苯并二苯添加剂的高效无卤刚性和柔性二元有机太阳能电池


由于可穿戴电子设备的日益普及，柔性有机太阳能电池（OSC）引起了广泛的关注。为了提高装置的效率和稳定性，我们制备了(2E,2'E)-3,3'-(4,4,9,9-四十六烷基-4,9-二氢-s-indaceno[1,2- b:5,6-b']二噻吩-2,7-二基）双（2-氰基丙烯酸）（IDT）基掺杂剂，通过在哌啶存在下使醛前体与氰乙酸反应而获得。在这里，我们通过将IDT添加到星型有源层PM6:Y6和PM6:BTP-eC9中来研究IDT对OSC性能的影响，以通过形态优化来提高OSC的性能。添加 5 wt% IDT 显着提高了器件性能，PM6:Y6 器件的 PCE 达到了 16.08%。电荷传输和复合动力学分析表明，适当浓度的IDT可以为载流子传输提供更好的通道，促进OSC中有效的电荷产生和提取。据观察，IDT的添加促进了激子的有效产生和解离，从而提高了OSC性能。采用 PM6:Y6:IDT 作为有源层薄膜制备了柔性无 ITO OSC，其 PCE 高达 12.59%，VOC、JSC 和 FF 分别为 0.83 V、23.21 mA/cm2 和 68.63%。因此，研究结果表明了一种可靠的方法，有可能提供具有优异性能和商业可行性的刚性和柔性OSC。