Bipolar polaron pair recombination in polymer/fullerene solar cells

Article

关键词: DETECTED MAGNETIC-RESONANCE;    CONJUGATED POLYMER;    CHARGE SEPARATION;   

DOI  :  10.1103/PhysRevB.92.245203

来源: SCIE

【 摘 要 】

We present a study of the rate-limiting spin-dependent charge-transfer processes in different polymer/fullerene bulk-heterojunction solar cells at 10 K. Observing central spin-locking signals in pulsed electrically detected magnetic resonance and an inversion of Rabi oscillations in multifrequency electron-double-resonance spectroscopy, we find that the spin response of both spin-coated and printed P3HT/PCBM and spin-coated PCDTBT/PCBM solar cells at low temperatures is governed by bipolar polaron pair recombination and quantitatively determine the polaron-polaron coupling strength with double electron-electron resonance experiments. Furthermore spin Hahn echo decay and inversion recovery measurements are performed to measure spin coherence and recombination times of the polaron pairs, respectively.

【 授权许可】

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