Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices , South China University of Technology , Guangzhou 510640 , P. R. China.
Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education , Hangzhou Normal University , Hangzhou 310012 , P. R. China.
ACS Appl Mater Interfaces. 2018 Aug 1;10(30):25589-25593. doi: 10.1021/acsami.8b06717. Epub 2018 Jul 17.
In this study, polymer solar cells employing poly(3-hexylthiophene) (P3HT) as a donor and fullerene derivative PCBM (phenyl-C-butyric acid methyl ester) or nonfullerene diketopyrrolopyrrole (DPP)-based small molecule (SF-DPPEH) as an acceptor are investigated. Device based on SF-DPPEH shows a remarkably high V of 1.20 V, whereas analogous device based on PCBM only delivers a V of 0.64 V. Employing transient photovoltage/photocurrent techniques, we measure charge carrier lifetime and density and nongeminate recombination rate in the photoactive layer and correlate material energetics and charge recombination dynamics with the change of V in the devices; thus, the extent to which two factors limit V can be quantified.
在这项研究中，我们采用聚（3-己基噻吩）（P3HT）作为给体，富勒烯衍生物 PCBM（苯丁酸甲酯）或非富勒烯二酮吡咯并吡咯（DPP）基小分子（SF-DPPEH）作为受体，研究了聚合物太阳能电池。基于 SF-DPPEH 的器件表现出显著的高开路电压（V）为 1.20V，而基于 PCBM 的类似器件仅提供 0.64V 的 V。我们采用瞬态光电压/光电流技术，测量了光活性层中载流子寿命和密度以及非复合复合速率，并将材料能态和电荷复合动力学与器件中 V 的变化相关联；因此，可以定量评估两个因素限制 V 的程度。
