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Optimization of hybrid organic-inorganic interdigitated photovoltaic device structure using a 2D diffusion model

Krali, E and Curry, RJ (2011) Optimization of hybrid organic-inorganic interdigitated photovoltaic device structure using a 2D diffusion model ACS Nano, 5 (4). pp. 3069-3078.

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To improve the efficiency of organic photovoltaic devices the inclusion of semiconducting nanoparticles such as PbS has been used to enhance near-infrared absorption. Additionally the use of interdigitated heterojunctions has been explored as a means of improving charge extraction. In this paper we provide a two-dimensional model taking into account these approaches with the aim of predicting an optimized device geometry to maximize the efficiency. The steady-state exciton population has been calculated in each of the active regions taking into account the full optical response based on using a finite difference approach to obtain approximate numerical solutions to the 2D exciton diffusion equation. On the basis of this we calculate the contribution of each active material to the device short circuit current and power conversion efficiency. We show that optimized structures can lead to power conversions efficiencies of 50% compared to a maximum of 17% for planar heterojunction devices. To achieve this the interdigitated region thickness should be 800 nm with PbS and C60 widths of 60 and 20 nm, respectively. Even modest nanopatterning using much thinner active regions provides improvements in efficiency and may be approached using a variety of methods including nanoimprinting lithography, nanotemplating, or the incorporation of presynthesized nanorod structures.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute
Authors :
Krali, E
Curry, RJ
Date : 22 March 2011
DOI : 10.1021/nn200197f
Additional Information : This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, Copyright © American Chemical Society after peer review and technical editing by the publisher.To access the final edited and published work see
Depositing User : Symplectic Elements
Date Deposited : 01 Dec 2011 13:05
Last Modified : 31 Oct 2017 14:09

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