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On the Relationship Between Donor/Acceptor Interface Energy Levels and Open‐Circuit Voltages
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2017-07-03 , DOI: 10.1002/aelm.201700115
Peicheng Li 1 , Weiji Hong 1 , Yiying Li 1 , Grayson Ingram 1 , Zheng-Hong Lu 1, 2
Affiliation  

Energy offset (EDA) from a number of donor/acceptor heterojunctions is measured using ultraviolet photoemission spectroscopy. It is found that substrate work functions have little impact on the energy level alignments at donor/acceptor heterojunctions. Planar‐heterojunction organic photovoltaic cells are made to test the relationship between energy offset and open‐circuit voltage (VOC). VOC is found to increase linearly as a function of EDA. The VOC, however, takes a surprising turn at EDA = 1.5 eV and starts to decrease as a function of donor–acceptor energy levels. To explain this experimental observation, a theoretical model to quantify the relationship between VOC and EDA is developed. The proposed model well explains the experimental data and, in particular, the reverse trend of VOC on EDA. By grouping several material constants into one variable, a simple universal plot that well describes the experimental data for both planar‐heterojunction and bulk‐heterojunction cells is generated.

中文翻译:

供体/受体界面能级与开路电压之间的关系

使用紫外光发射光谱法测量了许多施主/受主异质结的能量偏移(E DA)。发现衬底功函数对供体/受体异质结处的能级排列几乎没有影响。制作了平面异质结有机光伏电池,以测试能量补偿与开路电压(V OC)之间的关系。发现V OC作为E DA的函数线性增加。在V OC,但是,需要在一个令人惊讶的转ê DA= 1.5 eV,并开始根据供体-受体能级降低。为了解释该实验观察结果,建立了量化V OC和 E DA之间关系的理论模型。所提出的模型很好地解释了实验数据,尤其是V OCE DA上的反向趋势。通过将几个材料常数分组为一个变量,可以生成一个简单的通用图,该图很好地描述了平面异质结和体异质结单元的实验数据。
更新日期:2017-07-03
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