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On the question of the need for a built-in potential in Perovskite solar cells
- Perovskite semiconductors as the active materials in efficient solar cells exhibit free carrier diffusion lengths on the order of microns at low illumination fluxes and many hundreds of nanometers under 1 sun conditions. These lengthscales are significantly larger than typical junction thicknesses, and thus the carrier transport and charge collection should be expected to be diffusion controlled. A consensus along these lines is emerging in the field. However, the question as to whether the built-in potential plays any role is still of matter of some conjecture. This important question using phase-sensitive photocurrent measurements and theoretical device simulations based upon the drift-diffusion framework is addressed. In particular, the role of the built-in electric field and charge-selective transport layers in state-of-the-art p-i-n perovskite solar cells comparing experimental findings and simulation predictions is probed. It is found that while charge collection in the junction does not require a drift field per se, a built-inPerovskite semiconductors as the active materials in efficient solar cells exhibit free carrier diffusion lengths on the order of microns at low illumination fluxes and many hundreds of nanometers under 1 sun conditions. These lengthscales are significantly larger than typical junction thicknesses, and thus the carrier transport and charge collection should be expected to be diffusion controlled. A consensus along these lines is emerging in the field. However, the question as to whether the built-in potential plays any role is still of matter of some conjecture. This important question using phase-sensitive photocurrent measurements and theoretical device simulations based upon the drift-diffusion framework is addressed. In particular, the role of the built-in electric field and charge-selective transport layers in state-of-the-art p-i-n perovskite solar cells comparing experimental findings and simulation predictions is probed. It is found that while charge collection in the junction does not require a drift field per se, a built-in potential is still needed to avoid the formation of reverse electric fields inside the active layer, and to ensure efficient extraction through the charge transport layers.…
Author details: | Oskar J. SandbergORCiD, Jona KurpiersORCiDGND, Martin StolterfohtORCiDGND, Dieter NeherORCiDGND, Paul MeredithORCiD, Safa ShoaeeORCiDGND, Ardalan ArminORCiD |
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DOI: | https://doi.org/10.1002/admi.202000041 |
ISSN: | 2196-7350 |
Title of parent work (English): | Advanced materials interfaces |
Publisher: | Wiley |
Place of publishing: | Hoboken |
Publication type: | Article |
Language: | English |
Date of first publication: | 2020/03/20 |
Publication year: | 2020 |
Release date: | 2023/03/30 |
Tag: | built-in potential; charge collection; charge transport layers; perovskite solar cells |
Volume: | 7 |
Issue: | 10 |
Article number: | 2000041 |
Number of pages: | 8 |
Funding institution: | Ser Cymru Program through the European Regional Development Fund; Welsh; European Funding Office; Alexander von Humboldt FoundationAlexander von; Humboldt Foundation; Swansea University strategic initiative in; Sustainable Advanced Materials; EPSRCUK Research & Innovation; (UKRI)Engineering & Physical Sciences Research Council (EPSRC); [EP/N020863/1] Funding Source: UKRI |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |
Publishing method: | Open Access / Hybrid Open-Access |
License (German): | CC-BY - Namensnennung 4.0 International |