An analytical model for bulk heterojunction organic solar cells using a new empirical expression of space dependent photocarrier generation. (March 2016)

• Record Type: Journal Article
• Authors: Chowdhury, M.M.; Alam, M.K.
• Is Part Of: Solar energy. Volume 126(2016)
• Page Start: 64
• Page End: 72
• Publication Date: 2016-03
• Subjects: Organic solar cell -- Bulk heterojunction -- Empirical carrier generation rate -- Analytical model -- Current–voltage characteristic; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2015.12.050
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: An empirical expression of space dependent carrier generation rate is presented. The expression plays an alternative role for physics-based closed-form formula. The empirical expression shows good agreement with published data. An analytical model of current–voltage characteristics is derived. Abstract: We present an analytical model for bulk heterojunction organic solar cells on the basis of an empirical expression of space dependent carrier generation rate. By developing the empirical formula of the carrier generation rate and successfully incorporating that in the transport equations, we bring in the spatial distribution effect of generation rate into the current–voltage ( J–V ) characteristic of this solar cell. The proposed empirical expression helps us to derive a J–V curve expression, especially for the cases where carrier generation rate cannot be described by any physics-based closed form analytical expression and/or where the spatial distribution of the generation rate profile is to be extracted and used directly from published/available data. We justify the model by comparing with numerical simulations and published data.