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Doping-induced charge transfer in conductive polymers

Chinese Chemical Letters 2024年第1期35卷 45-51页

作者： Siyi Luo Zhen Xu Fei Zhong Hui Li Lidong Chen State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Molecular doping has become a widely used method to modulate the electric performance of organic semiconductors(OSC).Highly effective charge transfer during molecular doping is desired to achieve ideal electrical *** types of charge transfer mechanisms are widely accepted in molecular doping process:integer charge transfer(ICT)and charge transfer complex(CTC).In this review,fundamental principles of two mechanisms are revisited and the characterization methods are *** key points for the formation of two mechanisms are highlighted from aspects of molecular structure and process ***,the strategies to improve the proportion of ICT are ***,the challenges and perspectives for future developments in the molecular doping of polymer semiconductors are provided.

关键词： Molecular doping charge transfer integer charge transfer charge transfer complex Conjugated polymer

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Pinning energies of organic semiconductors in high-efficiency organic solar cells

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Journal of Semiconductors 2023年第3期44卷 52-61页

作者： Xian’e Li Qilun Zhang Xianjie Liu Mats Fahlman Laboratory of Organic Electronics Department of Science and Technology(ITN)Linköping UniversitySE-60174NorrköpingSweden Wallenberg Wood Science Center Department of Science and Technology(ITN)Linköping UniversitySE-60174NorrköpingSweden

With the emergence of new materials for high-efficiency organic solar cells(OSCs),understanding and finetuning the interface energetics become increasingly *** determination of the so-called pinning energies,one of the critical characteristics of the material to predict the energy level alignment(ELA)at either electrode/organic or organic/organic interfaces,are urgently needed for the new ***,pinning energies of a wide variety of newly developed donors and nonfullerene acceptors(NFAs)are measured through ultraviolet photoelectron *** positive pinning energies of the studied donors and the negative pinning energies of NFAs are in the same energy range of 4.3−4.6 eV,which follows the design rules developed for fullerene-based *** ELA for metal/organic and inorganic/organic interfaces follows the predicted behavior for all of the materials *** organic-organic heterojunctions where both the donor and the NFA feature strong intramolecular charge transfer,the pinning energies often underestimate the experimentally obtained interface vacuum level shift,which has consequences for OSC device performance.

关键词： organic semiconductors organic solar cells pinning energies integer charge transfer interface dipoles

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