研究目的
Investigating the build-up of space charge due to imbalanced transport in organic solar cells and its impact on charge collection.
研究成果
The study demonstrates a simple method to monitor space charge build-up in OPVs using EQE measurements and optical modeling. It shows that balanced transport is not strictly necessary for efficient thick-film OPVs if charge recombination is sufficiently reduced.
研究不足
The method requires knowledge of optical constants and is tested on a specific polymer/fullerene blend. The approach may not be directly applicable to all OPV materials without adjustments.
1：Experimental Design and Method Selection:
The study uses a numerical reconstruction approach based on white-light bias external quantum efficiency (EQE) spectra and optical modeling to monitor space charge build-up.
2：Sample Selection and Data Sources:
The experimental system is a blend of regioregular poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM).
3：List of Experimental Equipment and Materials:
Equipment includes a Keithley 4200 parameter analyzer, a class AAA solar simulator, and a custom-built Bentham PVE300 system for EQE measurements. Materials include P3HT, PCBM, and ZnO nanoparticles.
4：Experimental Procedures and Operational Workflow:
Devices were fabricated with an inverted structure, and EQE measurements were performed under different background photogeneration rates.
5：Data Analysis Methods:
Data analysis involved numerical drift-diffusion simulations and transfer-matrix calculations to model the charge collection probability and SCR width.
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