基于ZnPc/C_(60)太阳电池的光生电流研究

Investigation on photocurrent of ZnPc/C_(60) solar cells

本研究采用真空蒸镀法制备了ZnPc(20nm)/C60(10nm)电池,推导了该类型电池的光生电流表达式,并讨论了在光强和有效偏压恒定条件下的演变形式,实验结果证明理论分析是正确的.分析发现,小分子电池的短路电流密度随光强基本呈直线关系增长,决定此种关系的主因之一是有效偏压.100℃,20min的最佳退火工艺,将电池的短路电流密度提高了43.8%,将其衰减常数从5.6h提高到22.2h.本文认为,接触界面态和串联电阻的减小是电池电流水平提升的主要原因.

Solar cells with structure of ZnPc （20 nm）/C60 （ 10 nm） are fabricated by thermal evaporation. The photocurrent density （Jph） expressed by effective applied voltage （Vo - Va） and light intensity （I） is derived from an analytical method, and it is shown that the results from the model are in good agreement with experimental results. The short-circuit current density （Js~） exhibits a nearly linear dependence on light intensity, which is partially determined by effective applied voltage. Thermal annealing treatment under an optimal condition of 100 ℃ and 20 rain, improves Jscby 43.8% , lengthening its attenuation constant from 5.6h to 22.2 h, which is attributed to the improvement on interfacial morphology and the decrease of series resistance due to better contact of the layers.