To succeed in commercial applications, donor materials for organic solar cells should combine high stability and simple synthesis with high performance in devices. Here, we present a new small π-conjugated molecule, TPA-T-DCV-Ph, which meets those requirements. Simple and efficient three-step synthesis produces a push-pull molecule with triphenylamine donor and phenyldicyanovinyl acceptor groups, which is suitable for both solution processing and vacuum deposition. The unique property of TPA-T-DCV-Ph is an unusually long exciton diffusion length of >25 nm due to the combined effect of long exciton lifetime and surprisingly low energy disorder. This, together with a device engineering, resulted in >5% efficiency for TPA-T-DCV-Ph:C₇₀ vacuum-processed solar cells. The results obtained are envisioned to be further improved by optimizing the absorption of the molecule and light management in the device which can push the efficiency even further.

为了在商业应用中取得成功，有机太阳能电池的供体材料应将高稳定性，简单的合成与高性能的器件相结合。在这里，我们提出了一个满足这些要求的新的小π共轭小分子TPA-T-DCV-Ph。简单而有效的三步合成可生成具有三苯胺供体和苯基二氰基乙烯基受体基团的推挽分子，该分子既适用于溶液处理，又适用于真空沉积。TPA-T-DCV-Ph的独特属性是激子寿命长和出乎意料的低能量紊乱的共同作用，是激子扩散长度> 25 nm。这与设备工程一起使TPA-T-DCV-Ph：C _70的效率提高了5％以上真空处理的太阳能电池。通过优化分子的吸收和器件中的光管理，可以进一步提高效率，从而可以进一步改善获得的结果。