Biswajit Ray

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Contributions

Online Presentations (1-2 of 2)

  1. Optimum Morphology and Performance Gains of Organic Solar Cells

    09 Sep 2011 | Online Presentations | Contributor(s): Biswajit ray, Muhammad Alam

    Morphology of light absorbing layer is known to dictate the power conversion efficiency of organic photovoltaic (OPV) cell. The innovation of bulk heterojunction (BHJ) led to significant improvement for exciton harvesting, but carrier recombination at the distributed interfaces and variability of performance have been persistent concerns. The purpose of this paper is to theoretically explore the efficiency- space of OPV as a function of the degree of randomness of its morphology and to …

  2. Modeling and Optimization of Polymer Based Bulk Heterojunction (BH) Solar Cell

    15 Feb 2010 | Online Presentations | Contributor(s): Biswajit ray

    A polymer phase separation model based on Cahn-Hilliard equation and a three-dimensional (3D) coupled exciton/electron/hole transport model in the disordered, phase-segregated morphology so generated, allow us to predict, possibly for the first time, the morphology dependent performance limits of polymer/fullerene bulk heterostructure (BH) solar cells. We relate the optimum anneal time to polymer sizes, solvent content, film thickness, and anneal temperature and find that a regularization of …