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报道了利用聚(3-己基噻吩)(P3HT)作为前置缓冲层来弥补(4,8-双-(2-乙基己氧基)-苯并[1,2-b:4,5-b]二噻吩)-(4-氟代噻并[3,4-b]噻吩(PBDT-TT-F):[6,6]-苯基-C61-丁酸甲酯(PC61BM)共混体相异质结(BHJ)电池对450-600nm处光谱响应不足的新的器件结构设计思路.光谱带隙为1.8eV的PBDT-TT-F在550-700nm处有很强的光谱吸收,在有机太阳电池器件上有很好的应用潜能.但其在350-550nm处的吸收不强,影响了器件对太阳光谱的利用效率.与此相比,P3HT薄膜的光谱吸收主要在450-600nm范围内,同PBDT-TT-F形成良好的互补关系.新设计的器件外量子效率(EQE)研究结果表明,利用P3HT作为前置缓冲层可以与PBDT-TT-F:PC61BM薄膜中的PC61BM形成平面异质结,从而拓展了器件在450-600nm处的光谱响应范围,实现光谱增感作用.优化P3HT的厚度为20nm左右,器件对外输出的短路光电流密度从11.42mA·cm-2提高到12.15mA·cm-2,达到了6.3%的提升.
Reported the use of poly (3-hexylthiophene) (P3HT) as a pre-buffer to compensate for (4,8-bis- (2-ethylhexyloxy) -benzo [1,2- (4-fluorothieno [3,4-b] thiophene (PBDT-TT-F): [6,6] -phenyl-C61- butyric acid methyl ester (PC61BM) blend A new device structure design idea of heterojunction (BHJ) cell for the spectral response at 450-600 nm is shown in Fig. 1. The PBDT-TT-F with a band gap of 1.8 eV has strong spectral absorption at 550-700 nm, Solar cell devices have good potential applications, but its absorption at 350-550nm is not strong, affecting the utilization efficiency of the solar spectrum of the device.Compared with this, the spectral absorption of P3HT film mainly in the range of 450-600nm , Which is in good complementarity with PBDT-TT-F.The results of the newly designed device external quantum efficiency (EQE) show that the use of P3HT as a front-side buffer layer can form a planar heterostructure with PC61BM in PBDT-TT-F: PC61BM film And the spectral response range of the device is extended to achieve spectral sensitization.The optimized thickness of P3HT is about 20nm and the short-circuit photocurrent density of the device is increased from 11.42mA · cm-2 to 12.15mA · Cm-2, up 6.3%.