期刊
PHYSICAL REVIEW B
卷 79, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.201202
关键词
electron-hole recombination; magnetoresistance; magnetoresistive devices; organic light emitting diodes; radiation quenching; solar cells; thin film devices; tuning
资金
- Academy of Finland [116995]
- Center of Excellence
- SITRA-CIMO
- Academy of Finland (AKA) [116995, 116995] Funding Source: Academy of Finland (AKA)
Magnetoelectrical measurements were performed on diodes and bulk heterojunction solar cell blends (BHSCs) to clarify the role of formation of Coulombically bound electron-hole (e-h) pairs on the magnetoresistance (MR) response in organic thin-film devices. BHSCs are suitable model systems because they effectively quench excitons but the probability of forming e-h pairs in them can be tuned over orders of magnitude by the choice of material and solvent in the blend. We have systematically varied the e-h recombination coefficients, which are directly proportional to the probability for the charge carriers to meet in space, and found that a reduced probability of electrons and holes meeting in space lead to the disappearance of the MR. Our results clearly show that MR is a direct consequence of the e-h pair formation. We also found that the MR line shape follows a power-law dependence of B(0.5) at higher fields.
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