具有增强稳定性的高效三元全聚合物太阳能电池,Advanced Functional Materials

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具有增强稳定性的高效三元全聚合物太阳能电池
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-25 , DOI: 10.1002/adfm.202008494
Kui Feng _{1,

2} , Ziang Wu ₃ , Mengyao Su ₁ , Suxiang Ma ₁ , Yongqiang Shi ₁ , Kun Yang ₁ , Yang Wang ₁ , Yujie Zhang ₁ , Weipeng Sun ₁ , Xing Cheng ₁ , Limin Huang ₄ , Jie Min ₂ , Han Young Woo ₃ , Xugang Guo ₁

Affiliation

开发基于三元活性层的有机太阳能电池（OSC）是使光收集最大化并改善其光伏性能的最有效方法之一。但是，由于窄带隙聚合物受体的缺乏以及形态优化的挑战，这种策略在全聚合物太阳能电池（all-PSC）中取得的成功非常有限。实际上，三元全PSC的功率转换效率（PCE）甚至落后于二元全PSC。在此，基于超窄带隙（ultra-NBG）聚合物受体DCNBT-TPC，中带隙聚合物供体PTB7-Th和宽带隙聚合物供体PBDB-T实现了高效的三元全PSC。经过优化的三元全PSC产生了12.1％的出色PCE，短路电流密度高达21.9 mA cm ^-2。实际上，此PCE是三元all-PSC报告的最高值，并且远远高于相应的二进制all-PSC。此外，优化的三元全的PSC示出了具有光稳定性≈初始PCE的68％保留后400ħ照明，这是比二进制全的PSC更稳定。这项工作表明，利用基于超NBG聚合物受体与相容的聚合物供体混合的三元全聚物系统的使用是提高全PSC领域的有效策略。

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Highly Efficient Ternary All‐Polymer Solar Cells with Enhanced Stability

Developing organic solar cells (OSCs) based on a ternary active layer is one of the most effective approaches to maximize light harvesting and improve their photovoltaic performance. However, this strategy meets very limited success in all‐polymer solar cells (all‐PSCs) due to the scarcity of narrow bandgap polymer acceptors and the challenge of morphology optimization. In fact, the power conversion efficiencies (PCEs) of ternary all‐PSCs even lag behind binary all‐PSCs. Herein, highly efficient ternary all‐PSCs are realized based on an ultranarrow bandgap (ultra‐NBG) polymer acceptor DCNBT‐TPC, a medium bandgap polymer donor PTB7‐Th, and a wide bandgap polymer donor PBDB‐T. The optimized ternary all‐PSCs yield an excellent PCE of 12.1% with a remarkable short‐circuit current density of 21.9 mA cm⁻². In fact, this PCE is the highest value reported for ternary all‐PSCs and is much higher than those of the corresponding binary all‐PSCs. Moreover, the optimized ternary all‐PSCs show a photostability with ≈68% of the initial PCE retained after 400 h illumination, which is more stable than the binary all‐PSCs. This work demonstrates that the utilization of a ternary all‐polymer system based on ultra‐NBG polymer acceptor blended with compatible polymer donors is an effective strategy to advance the field of all‐PSCs.

更新日期：2020-10-25

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