Quantification of Temperature-Dependent Charge Separation and Recombination Dynamics in Non-Fullerene Organic Photovoltaics

Chan Christopher C. S.; Ma Chao; Zou XinhuiXing ZengshanZhang GuichuanYip Hin-LapTaylor Robert A.He YanWong Kam SingChow Philip C. Y.

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Quantification of Temperature-Dependent Charge Separation and Recombination Dynamics in Non-Fullerene Organic Photovoltaics

机译：Quantification of Temperature-Dependent Charge Separation and Recombination Dynamics in Non-Fullerene Organic Photovoltaics

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Transient optical spectroscopy is used to quantify the temperature-dependence of charge separation and recombination dynamics in P3TEA:SF-PDI2 and PM6:Y6, two non-fullerene organic photovoltaic (OPV) systems with a negligible driving force and high photocurrent quantum yields. By tracking the intensity of the transient electroabsorption response that arises upon interfacial charge separation in P3TEA:SF-PDI2, a free charge generation rate constant of approximate to 2.4 x 10(10) s(-1) is observed at room temperature, with an average energy of approximate to 230 meV stored between the interfacial charge pairs. Thermally activated charge separation is also observed in PM6:Y6, and a faster charge separation rate of approximate to 5.5 x 10(10) s(-1) is estimated at room temperature, which is consistent with the higher device efficiency. When both blends are cooled down to cryogenic temperature, the reduced charge separation rate leads to increasing charge recombination either directly at the donor-acceptor interface or via the emissive singlet exciton state. A kinetic model is used to rationalize the results, showing that although photogenerated charges have to overcome a significant Coulomb potential to generate free carriers, OPV blends can achieve high photocurrent generation yields given that the thermal dissociation rate of charges outcompetes the recombination rate.

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《Advanced functional materials》 |2021年第48期|2107157.1-2107157.8|共8页
作者
Chan Christopher C. S.; Ma Chao; Zou XinhuiXing ZengshanZhang GuichuanYip Hin-LapTaylor Robert A.He YanWong Kam SingChow Philip C. Y.;
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Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China|Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong 999077, Peoples R China;

Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China;

Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R ChinaSouth China Univ Technol, Sch Mat Sci & Engn, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, 381 Wushan Rd, Guangzhou 510640, Peoples R ChinaSouth China Univ Technol, Sch Mat Sci & Engn, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, 381 Wushan Rd, Guangzhou 510640, Peoples R China|City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Hong Kong 999077, Peoples R ChUniv Oxford, Clarendon Lab, Dept Phys, Parks Rd, Oxford OX1 3PU, EnglandUniv Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong 999077, Peoples R China;

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charge recombinations; charge separations; excitons; organic photovoltaics; ultrafast spectroscopy;

Quantification of Temperature-Dependent Charge Separation and Recombination Dynamics in Non-Fullerene Organic Photovoltaics

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