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首页> 外文期刊>ACS applied materials & interfaces >Role of Vertical Segregation in Semitransparent Organic Photovoltaics
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Role of Vertical Segregation in Semitransparent Organic Photovoltaics

机译：垂直隔离在半透明有机光伏中的作用

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摘要

In this work, the efficiency of semitransparent organic photovoltaic (OPV) devices for low intensity applications is investigated as a function of the processing conditions. It is observed that a thermal treatment of the organic layer induces fullerene migration toward the active layer/air interface. This physical process gives rise to different vertical segregation profiles of donor and acceptor molecules. Once the back contact is deposited, the amount of fullerene covering the surface will determine the contact selectivity and leakage current of the device. Control of this leakage current may not be essential for devices fabricated for high illumination condition applications. However, devices to be used under low illumination conditions may be highly influenced by the presence of this parasitic dark current which flows in the opposite direction to photogenerated current. At the proximity of the contacts, the vertical segregation profile is inferred from optical and electrical measurements. In particular, external quantum efficiency (EQE) measurements carried out from a relatively opaque back contact provide local information on the materials spatially close to the light source. Alternatively, capacitancevoltage measurements enable calculation of the percentage of fullerene molecules covering the cathode contact. Overall, a versatile method that can be used in regular and inverted configuration is presented that explains the different behavior observed for devices to be used under low illumination conditions.
机译：在这项工作中，针对低强度应用的半透明有机光伏（OPV）器件的效率根据加工条件进行了研究。观察到，有机层的热处理引起富勒烯向活性层/空气界面的迁移。该物理过程引起供体和受体分子的不同垂直分离分布。一旦沉积了背面触点，覆盖在表面上的富勒烯的数量将决定器件的触点选择性和泄漏电流。对于为高照明条件应用而制造的设备，控制该泄漏电流可能不是必不可少的。但是，在这种低照度条件下使用的器件会受到这种寄生暗电流的强烈影响，该暗电流的方向与光生电流的方向相反。在触点附近，可以从光学和电气测量中推断出垂直偏析轮廓。特别是，通过相对不透明的背接触进行的外部量子效率（EQE）测量提供了空间上靠近光源的材料的局部信息。可替代地，电容电压测量使得能够计算覆盖阴极触点的富勒烯分子的百分比。总的来说，提出了一种可用于常规和倒置配置的通用方法，该方法解释了在低照度条件下使用的设备观察到的不同行为。

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