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首页> 外文期刊>Advanced Functional Materials >Identifying the Electrostatic and Entropy-Related Mechanisms for Charge-Transfer Exciton Dissociation at Doped Organic Heterojunctions
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Identifying the Electrostatic and Entropy-Related Mechanisms for Charge-Transfer Exciton Dissociation at Doped Organic Heterojunctions

机译：识别掺杂有机异质结上电荷转移激子解离的静电和熵相关机制

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摘要

The electron donor/acceptor (D/A) heterojunction is the core for photocharge generation and recombination in organic photovoltaics (OPVs). Developing practical methods for the D/A heterojunction modification remains challenging and is rarely discussed in OPV research. Herein, the roles of molecular doping at the D/A heterojunction in the charge-transfer exciton dissociation and detailed energy loss are investigated, and new insights are gained into the functions of doping on the OPV performance. Heterojunction doping simultaneously enhances all three OPV parameters, especially the short-circuit current (J(sc)). It is shown that the J(sc) improvement is due to the combined effects of strengthened electric field and reduced activation energy, which is regulated via an entropy-related mechanism. The performance enhancement is further demonstrated in homojunction devices showing the great potential of interfacial doping to overcome the intrinsic limitation between high J(sc) and open-circuit voltage (V-oc) in OPVs.
机译：电子供体/受体（D / A）异质结是有机光伏（OPV）中的光放电产生和重组的核心。开发D / A异质结修改的实用方法仍然具有挑战性，并且在OPV研究中很少讨论。在此，研究了分子掺杂在D / A异质结中的作用，在电荷转移激子解离和详细能量损失中进行了新的洞察，并获得了掺杂对OPV性能的功能。异质结掺杂同时增强了所有三个OPV参数，尤其是短路电流（J（SC））。结果表明，J（SC）改进是由于增强电场的综合影响和降低的活化能量，其通过熵相关机制调节。在同性全调装置中进一步证明了性能增强，显示了界面掺杂的巨大潜力，以克服OPVS中高J（SC）和开路电压（V-OC）之间的内在限制。

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  • 来源
    《Advanced Functional Materials》 |2021年第25期|2101892.1-2101892.11|共11页
  • 作者

    Xue Wenyue; Tang Yabing; Zhou Xiaobo; Tang Zheng; Zhao Hanzhang; Li Tao; Zhang Lu; Liu Shengzhong (Frank); Zhao Chao; Ma Wei; Yan Han;

  • 作者单位

    Xi An Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Donghua Univ Ctr Adv Low Dimens Mat State Key Lab Modificat Chem Fibers & Polymer Mat Coll Mat Sci & Engn Shanghai 201620 Peoples R China;

    Xi An Jiao Tong Univ Ctr Spintron & Quantum Syst State Key Lab Mech Behav Mat Sch Mat Sci & Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Ctr Spintron & Quantum Syst State Key Lab Mech Behav Mat Sch Mat Sci & Engn Xian 710049 Peoples R China;

    Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Natl Minist Educ Shaanxi Engn Lab Adv Energy Technol Sch Mat Sci & Xian 710119 Peoples R China;

    Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Natl Minist Educ Shaanxi Engn Lab Adv Energy Technol Sch Mat Sci & Xian 710119 Peoples R China;

    Xi An Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    entropies; exciton dissociation; molecular doping; non#8208; radiative recombination; organic heterojunctions; organic solar cells;

    机译：熵;激子解离;分子掺杂;非＆＃8208;辐射重组;有机杂交;有机太阳能电池;

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