Wang, ZS;
Sha, WEI;
Choy, WCH;
(2016)
Exciton delocalization incorporated drift-diffusion model for bulk-heterojunction organic solar cells.
Journal of Applied Physics
, 120
(21)
, Article 213101. 10.1063/1.4970958.
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Sha_Exciton delocalization incorporated drift-diffusion model for bulk-heterojunction organic solar cells_VoR.pdf - Published Version Download (1MB) | Preview |
Abstract
Modeling the charge-generation process is highly important to understand device physics and optimize power conversion efficiency of bulk-heterojunction organic solar cells (OSCs). Free carriers are generated by both ultrafast exciton delocalization and slow exciton diffusion and dissociation at the heterojunction interface. In this work, we developed a systematic numerical simulation to describe the charge-generation process by a modified drift-diffusion model. The transport, recombination, and collection of free carriers are incorporated to fully capture the device response. The theoretical results match well with the state-of-the-art high-performance organic solar cells. It is demonstrated that the increase of exciton delocalization ratio reduces the energy loss in the exciton diffusion-dissociation process, and thus, significantly improves the device efficiency, especially for the short-circuit current. By changing the exciton delocalization ratio, OSC performances are comprehensively investigated under the conditions of short-circuit and open-circuit. Particularly, bulk recombination dependent fill factor saturation is unveiled and understood. As a fundamental electrical analysis of the delocalization mechanism, our work is important to understand and optimize the high-performance OSCs.
| Type: | Article |
|---|---|
| Title: | Exciton delocalization incorporated drift-diffusion model for bulk-heterojunction organic solar cells |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.4970958 |
| Publisher version: | https://doi.org/10.1063/1.4970958 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10053970 |
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