On the Relationship Between Donor/Acceptor Interface Energy Levels and Open‐Circuit Voltages,Advanced Electronic Materials

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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 (E_DA) 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 (V_OC). V_OC is found to increase linearly as a function of E_DA. The V_OC, however, takes a surprising turn at E_DA = 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 V_OC and E_DA is developed. The proposed model well explains the experimental data and, in particular, the reverse trend of V_OC on E_DA. 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 _OC在E _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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