Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Introduction:Charge accumulation in organic solar cells (OSCs) deteriorates the power conversion efficiency (PCE) by hindering charge extraction and inducing exciton loss processes such as exciton–polaron quenching (EPQ). Displacement current measurement (DCM), in which a triangular-wave voltage is applied to the device and the response current is measured, enables simultaneous observation of the displacement current originating from accumulated charges and the actual current [1]. By combining DCM with photoluminescence (PL) measurement (DCM-PL), the interaction between accumulated charges and excitons can also be observed. In this study, we applied DCM-PL to investigate the impact of post-annealing on charge dynamics and exciton quenching in a typical bulk heterojunction OSC with a P3HT:PCBM (1:1) active layer. DCM-PL measurements were performed under 550 nm illumination at a voltage sweep rate of 1000 V/s.
Result and Disscusion: Post-annealing significantly affected device performance. The fill factor (FF) increased from 0.29 before annealing to 0.35 at 110 ℃, but decreased at higher temperatures. The displacement current below Voc, depending on the amount of accumulated photogenerated charge, decreased with increasing annealing temperature up to 120 ℃ and then increased at higher temperatures, showing an inverse correlation with FF. Since photogenerated charge accumulation is determined by the balance among charge generation, recombination, and extraction, this correlation suggests that changes in charge extraction process contribute to the annealing-induced variation in FF. Meanwhile, PL quenching at 0 V increased from about 1% before annealing to 5.4% after annealing at 160 °C. This enhancement may be associated with increased EPQ due to photogenerated charges remaining in the active layer. These results demonstrate that DCM-PL provides insight into the relationship between charge dynamics and exciton quenching and their correlation with device performance in OSCs.
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