Synergistically optimizing the optoelectronic properties and morphology using a photo-active solid additive for high-performance binary organic photovoltaics

Mengting Wang; Tianyi Chen; Yaokai Li; Guanyu Ding; Zeng Chen; Jikun Li; Chang Xu; Adiljan Wupur; Chenran Xu; Yuang Fu; Jingwei Xue; Weifei Fu; Weiming Qiu; Xi Yang; Dawei Wang; Wei Ma; Xinhui Lu; Haiming Zhu; Xiankai Chen; Xiaoye Wang; Hongzheng Chen; Lijian Zuo

doi:10.1039/D3EE04065H

Synergistically optimizing the optoelectronic properties and morphology using a photo-active solid additive for high-performance binary organic photovoltaics†

Mengting Wang,

^a Tianyi Chen,^a Yaokai Li,^a Guanyu Ding,^a Zeng Chen,^c Jikun Li,^h Chang Xu,^a Adiljan Wupur,^a Chenran Xu,^d Yuang Fu,^e Jingwei Xue,^f Weifei Fu,

^b Weiming Qiu,ⁱ Xi Yang,ⁱ Dawei Wang,^d Wei Ma,^f Xinhui Lu,^e Haiming Zhu,

^c Xiankai Chen,^g Xiaoye Wang,

^h Hongzheng Chen

*^ab and Lijian Zuo

*^ab

Author affiliations

* Corresponding authors

^a State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
E-mail: hzchen@zju.edu.cn, zjuzlj@zju.edu.cn

^b Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 310014, P. R. China

^c Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China

^d Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics, and State Key Laboratory for Extreme Photonics and Instrumentation, Zhejiang University, Hangzhou 310058, P. R. China

^e Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong 999077, P. R. China

^f State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University, Xi’an Jiaotong University, Xi’an 710049, P. R. China

^g Institute of Functional Nano and Soft Materials, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, P. R. China

^h State Key Laboratory of Element-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China

ⁱ Guangzhou Chasinglight Technology Co., Ltd, Guangzhou 510535, P. R. China

Abstract

Additive engineering is one of the most effective strategies to manipulate the morphology and optoelectronic properties of bulk-heterojunction organic photovoltaics (OPVs). In this work, we explored a novel class of non-volatile photo-active additives with thermally activated delayed fluorescence (TADF) properties for high-performance OPVs. We found that energy levels play a key role in determining device performance. With a proper energetic structure and morphological features, a photo-active TADF-additive, i.e. 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), could not only tune the morphology of the active layer, but also facilitate the diffusion and separation of excitons, as well as enhance charge transport properties. As a result, OPVs with 4CzIPN showed a better performance compared to those without 4CzIPN and achieved an impressive power conversion efficiency of 19.4%, which was one of the highest among binary OPVs. Thus, this work opens a new avenue of using TADF-based photo-active solid additives for high-performance OPVs.

Energy & Environmental Science

Synergistically optimizing the optoelectronic properties and morphology using a photo-active solid additive for high-performance binary organic photovoltaics†

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Synergistically optimizing the optoelectronic properties and morphology using a photo-active solid additive for high-performance binary organic photovoltaics

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