We report a charge based model to establish the analytical equation, describing the nature of capacitance-voltage (C-V) characteristics of organic solar cells under dark condition (or organic diodes) over a wide range of voltage, extending from deep reverse bias to well above the built-in potential. The present model enables to explain the unusual peak in C-V characteristics of these devices, as observed experimentally by various groups. The results are further validated using self-consistent numerical simulation. Finally, we discuss the discrepancy and limitation of using Mott-Schottky relation to extract the built-in potential, doping density etc. in organic solar cells/diodes.
@article{arxiv.1809.08260,
title = {Analytical and numerical modeling of capacitance voltage characteristics of organic solar cells},
author = {Prashanth Kumar Manda and Soumya Dutta},
journal= {arXiv preprint arXiv:1809.08260},
year = {2018}
}