Morphology Dependent Short Circuit Current in Bulk Heterojunction Solar cell

Biswajit Ray, Purdue University - Main Campus
Pradeep R. Nair, Purdue University - Main Campus
Muhammad A. Alam, Purdue University - Main Campus

Date of this Version



The work was supported by the Center for Re-Defining Photovoltaic Efficiency through Molecule Scale Control, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award Number DE-SC0001085. The computational resources for this work were provided by the Network of Computational Nanotechnology under NSF Award EEC-0228390.

This document has been peer-reviewed.



Polymer based bulk heterostructure (BH) solar cell offers a relatively inexpensive option for the future solar cell technology, provided its efficiency increases beyond the current limit of 4-6%. In this paper we propose a novel theoretical/computational process/device simulation model of organic solar cell and thereby quantitatively and explicitly relate (possibly for the first time) the process conditions to the solar cell performance. We find that the maximum limit of short-circuit current (Jsc) follows a simple power law with the anneal time (Jsc ∝ ta^-n, for ta ≥ ta(opt)) , and we determine the optimum anneal time (ta(opt) ) considering exciton dissociation (t_hj) and percolating pathway formation for charge carriers (t_prc). Our results anticipate experimentally observed trends and have obvious and significant implications for the determination of performance limit and the optimization of the BH solar cell.


Organic, solar cell, Bulk heterojunction, process model


Electronic Devices and Semiconductor Manufacturing | Power and Energy