Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 38, Pages 20291-20304Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp01814a
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Funding
- Science Council (VR)
- Swedish Energy Agency
- Knut and Alice Wallenberg foundation (KAW)
- European Commission
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Charge generation in organic solar cells is a fundamental yet heavily debated issue. This article gives a balanced review of different mechanisms proposed to explain efficient charge generation in polymer-fullerene bulk-heterojunction solar cells. We discuss the effect of charge-transfer states, excess energy, external electric field, temperature, disorder of the materials, and delocalisation of the charge carriers on charge generation. Although a general consensus has not been reached yet, recent findings, based on both steady-state and transient measurements, have significantly advanced our understanding of this process.
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