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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Measuring Competing Recombination Losses in a Significantly Reduced Langevin System by Steady-State Photoinduced Absorption and Photocurrent Spectroscopy
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Measuring Competing Recombination Losses in a Significantly Reduced Langevin System by Steady-State Photoinduced Absorption and Photocurrent Spectroscopy

机译：通过稳态光导吸收和光电流光谱测量在显着减少的Langevin系统中的竞争重组损失

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摘要

Understanding and disentangling photophysical properties of long-lived photoexcitations in bulk heterojunction (BHJ) solar cells, which contribute mostly to photocurrent, provide essential guidelines to their improvement. However, to construct improved physical models, their rational design relies on reliable measurement techniques for charge recombination. Here, we combine photocurrent and photoinduced absorption spectroscopy (PCPIA) to directly probe the free carrier concentration and investigate loss mechanisms of long-lived excitations in nearly 10% efficient PPDT2FBT/PC70BM BHJ solar cells under steady-state operational conditions. From the PCPIA data obtained under open- circuit and short-circuit conditions, the absorption cross section and the concentration of photoexcitations are obtained. This material system exhibits an exceptionally low bimolecular recombination rate, about 300 times smaller than the diffusion-controlled electron and hole encounter rate. Furthermore, we observe that the fill factor is limited by losses originating from long-lived photoexcitations undergoing dispersive bimolecular recombination.
机译：散装异质结（BHJ）太阳能电池长寿相渗透（BHJ）太阳能电池的理解和解散光物理性质，主要为光电流提供了贡献，为其改进提供必要的指导。然而，为了构建改进的物理模型，其合理设计依赖于电荷重组的可靠测量技术。在此，我们将光电流和光抑制吸收光谱（PCPIA）结合在稳态运行条件下在稳态运行条件下直接探测了近10％的PPDT2FBT / PC70BM BHJ太阳能电池在近10％的PPDT2FBT / PC70BM BHJ太阳能电池中进行了自由载体浓度并调查了长期激发的损失机制。从在开路和短路条件下获得的PCPIA数据，获得吸收横截面和光透镜的浓度。该材料系统表现出具有极低的双分子重组率，比扩散控制的电子和孔遇到速率小约300倍。此外，我们观察到填充因子受源自经历分散的双分子重组的长寿光透镜的损失的限制。

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