Impacts of a second acceptor on the energy loss, blend morphology and carrier dynamics in non-fullerene ternary polymer solar cells,Journal of Materials Chemistry C

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Impacts of a second acceptor on the energy loss, blend morphology and carrier dynamics in non-fullerene ternary polymer solar cells
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-08-05 , DOI: 10.1039/d0tc02582h
Bei Wang _{1,

2,

3,

4,

5} , Yingying Fu _{1,

2,

3,

4,

5} , Qingqing Yang _{1,

2,

3,

4,

5} , Jiang Wu _{1,

2,

3,

4,

5} , Youzhan Li _{1,

2,

3,

4,

5} , Ganesh D. Sharma _{6,

7,

8,

9} , Mukhamed L. Keshtov _{10,

11,

12} , Zhiyuan Xie _{1,

2,

3,

4,

5}

Affiliation

Using a ternary blend consisting of two donors/one acceptor or one donor/two acceptors is a potential strategy to increase the power conversion efficiency (PCE) of polymer solar cells (PSCs). Herein, ternary PSCs based on PBDB-T:IT-4F:O6T-4F blends have been investigated by employing narrow bandgap O6T-4F as a second acceptor. Our studies indicate that introduction of 20% O6T-4F in the acceptor moiety can increase the PCE from 9.5% for the binary PBDB-T:IT-4F (1 : 1) cell to 10.5% for the ternary PBDB-T:IT-4F:O6T-4F (1 : 0.8 : 0.2) cell. The enhancement is attributed to a compromise between the increased short-circuit current (J_SC) and open-circuit voltage (V_OC) and the decreased fill factor (FF) with addition of the O6T-4F acceptor. It is shown that O6T-4F lowers the energy loss (E_loss) occurring in the binary PBDB-T:IT-4F (1 : 1) blend, leading to a higher V_OC of the ternary PSCs with regard to the binary PBDB-T:IT-4F PSCs. E_loss is decreased from 0.80 eV for the binary PBDB-T:IT-4F (1 : 1) blend to 0.61 eV for the ternary PBDB-T:IT-4F:O6T-4F (1 : 0.8 : 0.2) blend. At the same time, the addition of the O6T-4F acceptor reduces the aggregation of the PBDB-T donor in the ternary blends. Ultra-fast transient absorption demonstrates that the hole transfer and subsequent carrier recombination occur faster in the ternary blend than in the PBDB-T:IT-4F blend, which accounts for a slightly decreased FF in the ternary PSCs.

中文翻译：

第二受体对非富勒烯三元聚合物太阳能电池中能量损失，共混物形态和载流子动力学的影响

使用由两个施主/一个受主或一个施主/两个受主组成的三元共混物是提高聚合物太阳能电池（PSC）的功率转换效率（PCE）的潜在策略。在本文中，已经通过使用窄带隙O6T-4F作为第二受体研究了基于PBDB-T：IT-4F：O6T-4F共混物的三元PSC。我们的研究表明，在受体部分引入20％的O6T-4F可使PCE从二元PBDB-T：IT-4F（1：1）细胞的9.5％增加到三元PBDB-T：IT-F-的10.5％。 4F：O6T-4F（1：0.8：0.2）单元格。增强归因于短路电流（J _SC）和开路电压（V _OC）增加之间的折衷）和添加的O6T-4F受体降低的填充因子（FF）。结果表明，O6T-4F降低了二进制PBDB-T：IT-4F（1：1）混合物中发生的能量损失（E _loss），从而导致相对于二进制PBDB-，三元PSC的V _OC更高。T：IT-4F PSC。电子_损失从三元PBDB-T：IT-4F（1：1）混合物的0.80 eV降至三元PBDB-T：IT-4F：O6T-4F（1：0.8：0.2）混合物的0.61 eV。同时，O6T-4F受体的加入减少了三元共混物中PBDB-T供体的聚集。超快速瞬态吸收表明，三元混合物中的空穴转移和随后的载流子重组比PBDB-T：IT-4F混合物中的迁移更快，这说明三元PSC中的FF略有降低。

更新日期：2020-09-03

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