An extremely strong room-temperature photocurrent- (PC- or IPC-) detected magnetic resonance (PCDMR) that elucidates transport and trapping phenomena in organic devices, in particular solar cells, is described. When monitoring the transient PCDMR in indium tin oxide (ITO)/poly(2-methoxy-5-(2{'}-ethyl)-hexoxy-1,4-phenylenevinylene) (MEH-PPV)/Al devices, where the MEH-PPV film was baked overnight at 100 ^∘{}C in O₂, it is observed that |ΔIPC/IPC| peaks at values 1, where ΔIPC is the change in IPC induced by magnetic resonance conditions. Importantly, ΔIPC and IPC are of different origin. The mechanism most likely responsible for this effect is the spin-dependent formation of spinless bipolarons adjacent to negatively charged deep traps, apparently induced in particular by oxygen centers, to form trions.
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Chen et al. (2012) studied this question.
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