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Efficient modulation of end groups for the asymmetric small molecule acceptors enabling organic solar cells with over 15% efficiency
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/05 , DOI: 10.1039/d0ta01032d Gang Li 1, 2, 3, 4, 5 , Dandan Li 1, 2, 3, 4, 5 , Ruijie Ma 6, 7, 8, 9, 10 , Tao Liu 1, 2, 3, 4, 5 , Zhenghui Luo 6, 7, 8, 9, 10 , Guanwei Cui 1, 2, 3, 4, 5 , Lili Tong 1, 2, 3, 4, 5 , Ming Zhang 11, 12, 13, 14, 15 , Zaiyu Wang 11, 12, 13, 14, 15 , Feng Liu 11, 12, 13, 14, 15 , Liang Xu 15, 16, 17, 18 , He Yan 6, 7, 8, 9, 10 , Bo Tang 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/05 , DOI: 10.1039/d0ta01032d Gang Li 1, 2, 3, 4, 5 , Dandan Li 1, 2, 3, 4, 5 , Ruijie Ma 6, 7, 8, 9, 10 , Tao Liu 1, 2, 3, 4, 5 , Zhenghui Luo 6, 7, 8, 9, 10 , Guanwei Cui 1, 2, 3, 4, 5 , Lili Tong 1, 2, 3, 4, 5 , Ming Zhang 11, 12, 13, 14, 15 , Zaiyu Wang 11, 12, 13, 14, 15 , Feng Liu 11, 12, 13, 14, 15 , Liang Xu 15, 16, 17, 18 , He Yan 6, 7, 8, 9, 10 , Bo Tang 1, 2, 3, 4, 5
Affiliation
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Non-fullerene organic solar cells (OSCs) have attracted tremendous interest and made an impressive breakthrough, largely due to advances in high-performance small molecule acceptors (SMAs). The relationship between short-circuit current density (JSC) and open-circuit voltage (VOC) is usually shown as one falls, the other rises. Controlling the trade-off between JSC and VOC to harvest high power conversion efficiencies (PCEs) still remains as a challenge. Herein, dithieno[3,2-b:2′,3′-d]pyrrole (DTP) based asymmetric SMAs with different chlorinated dicyanoindanone-based end groups, named TPIC, TPIC-2Cl and TPIC-4Cl, are designed and synthesized. These asymmetric acceptors exhibit a remarkable red-shifted absorption profile, while energy levels are simultaneously down-shifted when the numbers of chlorine atoms alter from 0, 1 to 2, due to the gradually improved electronegativity. As a result, PM7:TPIC-4Cl based OSCs achieved a champion PCE of 15.31%, which is the highest PCE for non-fullerene binary OSCs based on asymmetric SMAs. The superiority of the PM7:TPIC-4Cl system consists of the balanced charge transport, favorable phase separation, efficient exciton dissociation and extraction, coupled with the remarkable π–π stacking and crystallinity of the SMAs. Our results highlight the important strategy of asymmetric molecular design to optimize the trade-off between VOC and JSC, reaching a high PCE.
中文翻译：
非对称小分子受体的端基有效调节，使有机太阳能电池的效率超过15％
非富勒烯有机太阳能电池（OSC）引起了极大的兴趣，并取得了令人印象深刻的突破，这在很大程度上归功于高性能小分子受体（SMA）的进步。短路电流密度（J SC）和开路电压（V OC）之间的关系通常表示为一个下降，另一个上升。控制J SC和V OC之间的权衡以获取高功率转换效率（PCE）仍然是一个挑战。在此，双硫醇[3，2- b：2′，3′- d设计并合成了基于吡咯（DTP）的不对称SMA，具有不同的基于氯化二氰基茚满酮的端基，分别命名为TPIC，TPIC-2Cl和TPIC-4Cl。这些不对称受体表现出显着的红移吸收曲线，而当氯原子数从0、1变为2时，由于逐渐提高的电负性，其能级同时下移。结果，基于PM7：TPIC-4Cl的OSC达到了15.31％的最佳PCE，这是基于不对称SMA的非富勒烯二元OSC的最高PCE。PM7：TPIC-4Cl系统的优越性包括平衡的电荷传输，有利的相分离，有效的激子离解和提取，以及SMA的显着π-π堆积和结晶性。V OC和J SC，达到了较高的PCE。
更新日期：2020-03-26
中文翻译：
非对称小分子受体的端基有效调节，使有机太阳能电池的效率超过15％
非富勒烯有机太阳能电池（OSC）引起了极大的兴趣，并取得了令人印象深刻的突破，这在很大程度上归功于高性能小分子受体（SMA）的进步。短路电流密度（J SC）和开路电压（V OC）之间的关系通常表示为一个下降，另一个上升。控制J SC和V OC之间的权衡以获取高功率转换效率（PCE）仍然是一个挑战。在此，双硫醇[3，2- b：2′，3′- d设计并合成了基于吡咯（DTP）的不对称SMA，具有不同的基于氯化二氰基茚满酮的端基，分别命名为TPIC，TPIC-2Cl和TPIC-4Cl。这些不对称受体表现出显着的红移吸收曲线，而当氯原子数从0、1变为2时，由于逐渐提高的电负性，其能级同时下移。结果，基于PM7：TPIC-4Cl的OSC达到了15.31％的最佳PCE，这是基于不对称SMA的非富勒烯二元OSC的最高PCE。PM7：TPIC-4Cl系统的优越性包括平衡的电荷传输，有利的相分离，有效的激子离解和提取，以及SMA的显着π-π堆积和结晶性。V OC和J SC，达到了较高的PCE。
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