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近年来,共轭聚合物和钙钛矿型有机金属卤化物被视为极具潜力的光伏材料,引起了广泛的研究兴趣.本文通过引入两种本体异质结(BHJ)聚合物:富勒烯活性层,大幅提高了基于CH_3NH_3PbI_(3-x)Cl_x的钙钛矿太阳能电池的近红外光响应特性.其中,基于窄带隙聚合物PDPP3T的钙钛矿/BHJ杂化太阳能电池在近红外区域(800~1000 nm)内的外量子效率(EQE)峰值高达46%,且该区域已经超出了CH_3NH_3PbI_(3-x)Cl_x型太阳能电池的光响应范围(300~800 nm).相较于参照的钙钛矿太阳能电池,近红外区域大幅提升的EQE为钙钛矿/BHJ杂化太阳能电池贡献了额外的电流密度(~5 mA cm~(-2)),因此其光电转换效率达到了12%以上.此外,引入基于聚合物PDTP-DFBT的BHJ也可以使钙钛矿太阳能电池在近红外区域的EQE达到40%以上.研究结果也表明优化BHJ的聚合物:富勒烯比例是提高这类钙钛矿-聚合物杂化太阳能电池性能的关键.
In recent years, conjugated polymers and perovskite organometallic halides have been regarded as potential photovoltaic materials and attracted a great deal of research interest.Through the introduction of two kinds of bulk heterojunction (BHJ) polymers, Fuller Allylic active layer, which greatly improves the near-infrared photoresponse of perovskite solar cells based on CH_3NH_3PbI_ (3-x) Cl_x, in which the perovskite / BHJ hybrid solar cells based on the narrow bandgap polymer PDPP3T exhibit near-infrared (800 ~ 1000 nm) peak value of external quantum efficiency (EQE) up to 46%, and the region has exceeded the photoresponse range (300 ~ 800 nm) of CH_3NH_3PbI_ (3-x) Cl_x solar cell.Compared with the reference Of the perovskite solar cells and a substantial increase in the near infrared region of the EQE contributes an additional current density (~ 5 mA cm -2) to the perovskite / BHJ hybrid solar cell, resulting in a photoelectric conversion efficiency of 12 % .In addition, the introduction of polymer-based PDTP-DFBT-based BHJ can make perovskite solar cells in the near-infrared region EQE more than 40% .The results also show that the optimization of BHJ polymer: fullerenes ratio is to improve this Key to Perovskite - Polymer Hybrid Solar Cells.