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    “功能pi-體系的分子工程”先導B專項系列報道---化學所在有機太陽能電池中電荷轉移機理研究方面取得重要進展
    2019-07-23 | 編輯: | 【 】【打印】【關閉

    近年來,有機太陽能電池(OPV)領域取得了迅猛的發展,其光電轉化效率已經突破了15%,展現了光明的應用前景。從光活性材料的化學結構特點理解OPV中電荷轉移機理,特別是低能量損失下激子解離的驅動力來源,對于設計新穎材料提高電池性能具有重要的意義。

    在中國科學院和國家自然科學基金委的支持下,化學所高分子物理與化學實驗室侯劍輝課題組的姚惠峰等人,開展了有機光伏分子化學結構與電荷產生機理間構效關系的相關研究。在前期的工作中(Chin. J. Chem. 2018, 36, 491-494),研究人員發現OPV中電子給體和電子受體的分子表面靜電勢(ESP)存在較大的差異,促進了電荷的高效生成。

    最近,姚惠峰等人設計了新穎的聚合物給體材料PTO2并詳細研究了分子表面ESP對電荷轉移過程的影響機制。研究的結果表明,PTO2與非富勒烯受體材料IT-4F存在顯著的ESP差異,相應的分子間電場提供了激子解離的驅動力,促進了電荷轉移,基于此的電池具有高效的電荷生成效率;而在PTO2與富勒烯衍生物受體的界面,ESP的差異相對較小,電荷轉移需要額外電場的輔助。另外,研究人員與瑞典林雪平大學和隆德大學的合作者在器件和光物理方面開展了相應的研究,對ESP理論具有重要的支撐。該工作建立了分子結構與電荷轉移過程的聯系,為高效率光伏材料的設計提供了全新的思路,相關研究工作發表在近期的J. Am. Chem. Soc. 2019, 141, 7743-7750,文章第一作者是姚惠峰博士。

           圖 ESP差異促進電荷轉移態的形成

     

    高分子物理與化學實驗室

    2019723

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