Journal
PHYSICAL REVIEW APPLIED
Volume 10, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.10.054019
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Funding
- Academy of Finland [279055]
- Jane and Aatos Erkko foundation through project ASPIRE
- Otto A. Malm foundation
- Vilho, Yrjo and Kalle Vaisala Foundation
- Swedish Cultural Foundation in Finland
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We have extended the Charge Extraction by a Linearly Increasing Voltage (CELIV) technique for determination of the built-in potential and the charge-carrier mobility in thin-film metal-insulator-metal (M-I-M) diodes. The validity of the presented analytical theory is verified by drift-diffusion simulations and experimentally demonstrated on organic solar cells. In contrast to the original CELIV theory, which assumes a uniform charge-carrier distribution in the active layer of the device, here we derive an analytical expression for determining the built-in potential and mobility in the case of a nonuniform charge-carrier distribution where charges have diffused into the active layer from the contacts. The extended CELIV theory is applicable on all thin-film M-I-M diodes, e.g., organic solar cells. Drift-diffusion simulations show that the error for mobility estimation can be an order of magnitude if not correcting for the carrier profile.
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