Journal
ADVANCED MATERIALS INTERFACES
Volume 7, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/admi.202000041
Keywords
built-in potential; charge collection; charge transport layers; perovskite solar cells
Funding
- Ser Cymru Program through the European Regional Development Fund
- Welsh European Funding Office
- Alexander von Humboldt Foundation
- Swansea University strategic initiative in Sustainable Advanced Materials
- EPSRC [EP/N020863/1] Funding Source: UKRI
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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-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.
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