光电流
材料科学
活动层
带隙
温度系数
开路电压
电阻式触摸屏
光电子学
光伏系统
电压
有机太阳能电池
太阳能电池
分析化学(期刊)
图层(电子)
化学
纳米技术
电气工程
复合材料
有机化学
工程类
聚合物
薄膜晶体管
作者
Bakhtyar Ali,Roy Murray,Steven Hegedus,S. İsmat Shah
摘要
Current-voltage (J-V) analysis of poly (3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) blend organic solar cells (OSC) at various temperatures has been recorded and analyzed. The photovoltaic parameters extracted from a lumped circuit analysis completely describe the illuminated J-V data from far reverse bias to beyond the open circuit voltage (Voc). A simple model for carrier collection, previously applied to inorganic thin film solar cells, has been used to describe the voltage dependence of the photocurrent, JL(V), with only one adjustable parameter, Lc/D, the ratio of the carrier collection length to the active-layer thickness. Measured J-V curves of a variety of OSCs with varying thickness and blend ratios are closely fit with this model. Effect of resistive and collection losses has been quantified and removed, allowing the intrinsic junction behavior to be uncovered. The temperature dependence of Voc is linear with negative temperature coefficient, dVoc/dT,∼ −1 mV/K. The values of the effective bandgap of the blend obtained from the intercept at T = 0 K decrease with the increase of the PCBM concentration. Our data support the idea of existence of mid-bandgap states, which increase with the increase in the disorder in the active layer.
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