Desired open-circuit voltage increase enables efficiencies approaching 19% in symmetric-asymmetric molecule ternary organic photovoltaics

被引：280

作者：

Zhan, Lingling ^{[1
,5
]}

Li, Shuixing ^{[1
]}

Li, Yaokai ^{[1
]}

Sun, Rui ^{[2
]}

Min, Jie ^{[2
]}

Bi, Zhaozhao ^{[3
]}

Ma, Wei ^{[3
]}

Chen, Zeng ^{[4
]}

Zhou, Guangqing ^{[4
]}

Zhu, Haiming ^{[4
]}

Shi, Minmin ^{[1
]}

Zuo, Lijian ^{[1
]}

Chen, Hongzheng ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Polymer Sci & Engn, State Key Lab Silicon Mat, MOE Key Lab Macromol Synth & Functionalizat, Hangzhou 310027, Peoples R China

[2] Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China

[3] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[4] Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China

[5] Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 311121, Peoples R China

来源：

JOULE | 2022年 / 6卷 / 03期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

POLYMER SOLAR-CELLS; 17-PERCENT EFFICIENCY; FULLERENE;

D O I：

10.1016/j.joule.2022.02.001

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The large open-circuit voltage (V-oc) loss is currently the main obstacle for pursuing the highly efficient organic photovoltaics (OPVs). To address this issue, we construct the ternary OPVs (TOPVs) consisting of symmetric BTP-eC9 and asymmetric BTP-S9 acceptors with similar absorption profiles and demonstrate it as a feasible way to increase V-oc via reducing the energetic disorder and non-radiative decay. This strategy enables a desired higher voltage in TOPVs than those in both binary OPVs, without sacrificing absorbing range. Besides, the ternary blend exhibits enhanced charge transport property due to stronger pi-pi stacking than binary films, resulting in the enhanced fill factor (FF). Consequently, the optimal TOPV exhibits a champion efficiency of 18.8% (certified as 18.7%) with a high voltage of 0.861 V and a high FF of 79.34%, representing the best among certified single-junction OPVs. This work demonstrates an effective approach to increase V-oc, paving the way toward high-efficiency OPVs.

引用

页码：662 / 675

页数：15

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