期刊
PHYSICAL REVIEW B
卷 80, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.075203
关键词
-
资金
- Bundesministerium fur Bildung und Forschung [03SF0334F]
- Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology
We propose a model to explain the reduced bimolecular recombination rate found in state-of-the-art bulk heterojunction solar cells. When compared to the Langevin recombination, the experimentally observed rate is one to four orders of magnitude lower but gets closer to the Langevin case for low temperatures. Our model considers the organic solar cell as device with carrier-concentration gradients, which form due to the electrode/blend/electrode device configuration. The resulting electron concentration under working conditions of a solar cell is higher at the cathode than at the anode and vice versa for holes. Therefore, the spatially dependent bimolecular recombination rate, proportional to the local product of electron and hole concentrations, is much lower as compared to the calculation of the recombination rate based on the extracted and thus averaged charge-carrier concentrations. We consider also the temperature dependence of the recombination rate, which can be described with our model.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据