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Cited by 302

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Nongeminate Recombination and Charge Transport Limitations in Diketopyrrolopyrrole‐Based Solution‐Processed Small Molecule Solar Cells

Proctor, Christopher M., Kim, Chunki, Neher, Dieter, Nguyen, Thuc‐Quyen·2013·Advanced Functional Materials

Abstract

Charge transport and nongeminate recombination are investigated in two solution‐processed small molecule bulk heterojunction solar cells consisting of diketopyrrolopyrrole (DPP)‐based donor molecules, mono‐DPP and bis‐DPP, blended with [6,6]‐phenyl‐C71‐butyric acid methyl ester (PCBM). While the bis‐DPP system exhibits a high fill factor (62%) the mono‐DPP system suffers from pronounced voltage dependent losses, which limit both the fill factor (46%) and short circuit current. A method to determine the average charge carrier density, recombination current, and effective carrier lifetime in operating solar cells as a function of applied bias is demonstrated. These results and light intensity measurements of the current‐voltage characteristics indicate that the mono‐DPP system is severely limited by nongeminate recombination losses. Further analysis reveals that the most significant factor leading to the difference in fill factor is the comparatively poor hole transport properties in the mono‐DPP system (2 × 10−5 cm 2 V−1 s−1 versus 34 × 10−5 cm 2 V−1 s−1). These results suggest that future design of donor molecules for organic photovoltaics should aim to increase charge carrier mobility thereby enabling faster sweep out of charge carriers before they are lost to nongeminate recombination.

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Metadata

Authors
Proctor, C. M., Kim, C., Neher, D., & Nguyen, T.
Venue
Advanced Functional Materials
Publisher
Wiley
Published
2013-02-25
Volume
23
Issue
28
Pages
3584-3594
ISSN
  • 1616-301X (ISSN-L)
  • 1616-3028
OpenAlex
W2007969728
Cited by
302
References
37
FWCI
21.77
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Nongeminate Recombination and Charge Transport Limitations in Diketopyrrolopyrrole‐Based Solution‐Processed Small Molecule Solar Cells. https://app.cochat.ai/papers/10.1002/adfm.201202643
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Proctor, C. M., Kim, C., Neher, D., & Nguyen, T. (2013). Nongeminate Recombination and Charge Transport Limitations in Diketopyrrolopyrrole‐Based Solution‐Processed Small Molecule Solar Cells. Advanced Functional Materials. https://doi.org/10.1002/adfm.201202643

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