We observe a universal feature in the frequency dependence of intensity modulated photocurrent Iph based on studies of a variety of efficient bulk-heterojunction polymer solar cells (BHJ-PSCs). This feature of Iph appears in the form of a local maximum in the 5 kHz < frequency < 10 kHz range and is observed to be largely independent of the external parameters such as modulated light intensity (Lac), wavelength, temperature (T), and external field (EF) over a wide range. Simplistic kinetic models involving carrier generation, recombination and extraction processes are used to interpret the overall essential features of Iph and correlate it to the device parameters.
@article{arxiv.1008.1115,
title = {Universality in Intensity Modulated Photocurrent in Bulk-Heterojunction Polymer Solar Cells},
author = {Monojit Bag and K. S. Narayan},
journal= {arXiv preprint arXiv:1008.1115},
year = {2015}
}