journal article·2025-02

Extending Exciton Diffusion Length via an Organic‐Metal Platinum Complex Additive for High‐Performance Thick‐Film Organic Solar Cells

Wentao Zou, Yanna Sun, Lingya Sun, Xunchang Wang, Chuanlin Gao, Dongcheng Jiang, Jinyang Yu, Guangye Zhang, Hang Yin, Renqiang Yang, Haiming Zhu, Hongzheng Chen, Ke Gao

Advanced Materials· Volume 37· Issue 8
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Abstract

Abstract The long exciton diffusion length (LD) plays an important role in promoting exciton dissociation, suppressing charge recombination, and improving the charge transport process, thereby improving the performance of organic solar cells (OSCs), especially in thick‐film OSCs. However, the limited LD hinders further improvement in device performance as the film thickness increases. Here, an organic‐metal platinum complex, namely TTz‐Pt, is synthesized and served as a solid additive into the D18‐Cl:L8‐BO system. The addition of TTz‐Pt enhanced the crystallinity of blends, reduced energy disorder, and trap density, and decreased non‐radiative recombination and exciton binding energy, which is conducive to prolonging the LD in the TTz‐Pt‐treated film, thereby facilitating the exciton dissociation and charge transport process along with inhibiting the charge recombination. Consequently, the TTz‐Pt‐treated D18:L8‐BO:IDIC device (100 nm) exhibits a champion power conversion efficiency (PCE) of 20.12% (certified as 19.54%), one of the highest PCEs reported for OSCs to date. Remarkably, a record‐breaking PCE of 18.84% is yielded for the active layer thickness of 300 nm. Furthermore, the TTz‐Pt exhibits superior universality in improving the performance of OSCs. This work provides a simple and universal approach to extending LD by introducing an organic‐metal platinum complex as a solid additive to achieve highly efficient thick‐film OSCs.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao 266237 P. R. China

Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials & Technology Jianghan University Wuhan 430056 P. R. China

College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 P. R. China

School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China

State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China

State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Excited State Materials of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou Zhejiang 310027 P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Basic and Applied Basic Research Foundation of Guangdong Province · China Postdoctoral Science Foundation · Shandong Provincial Postdoctoral Science Foundation · Natural Science Foundation of Shandong Province

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