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This research aims to identify how small impurity levels affect the efficiency of organic solar cells through enhanced recombination mechanisms.

Identifying a Threshold Impurity Level for Organic Solar Cells: Enhanced First‐Order Recombination Via Well‐Defined PC84BM Traps in Organic Bulk Heterojunction Solar Cells

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Randomized trial examines how impurities impact efficiency in organic solar cells, suggesting mechanisms behind losses.

This research aims to identify how small impurity levels affect the efficiency of organic solar cells through enhanced recombination mechanisms.
Investigated the effects of impurity in polymer bulk heterojunction solar cells using a blend of PCDTBT and PC 60 BM.
Studied the trap density dependent recombination rates with the introduction of PC 84 BM as a trap site.
Analyzed the recombination mechanisms, focusing on bimolecular and Shockley–Read–Hall processes.
The introduction of PC 84 BM significantly increased the trap-assisted recombination rate in the solar cells.
Efficiency measures such as open circuit voltage, short circuit current, and fill factor were all reduced due to trap-induced recombination losses.
The study demonstrated that even minimal impurities can markedly affect solar cell performance.

Cowan et al. (2011) studied this question.

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