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Journal of Photonics for Energy • Open Access

Device and morphological engineering of organic solar cells for enhanced charge transport and photovoltaic performance
Author(s): Nirmal Adhikari; Devendra Khatiwada; Ashish Dubey; Qiquan Qiao

Paper Abstract

Conjugated polymers are potential materials for photovoltaic applications due to their high absorption coefficient, mechanical flexibility, and solution-based processing for low-cost solar cells. A bulk heterojunction (BHJ) structure made of donor–acceptor composite can lead to high charge transfer and power conversion efficiency. Active layer morphology is a key factor for device performance. Film formation processes (e.g., spray-coating, spin-coating, and dip-coating), post-treatment (e.g., annealing and UV ozone treatment), and use of additives are typically used to engineer the morphology, which optimizes physical properties, such as molecular configuration, miscibility, lateral and vertical phase separation. We will review electronic donor–acceptor interactions in conjugated polymer composites, the effect of processing parameters and morphology on solar cell performance, and charge carrier transport in polymer solar cells. This review provides the basis for selection of different processing conditions for optimized nanomorphology of active layers and reduced bimolecular recombination to enhance open-circuit voltage, short-circuit current density, and fill factor of BHJ solar cells.

Paper Details

Date Published: 16 January 2015
PDF: 17 pages
J. Photon. Energy. 5(1) 057207 doi: 10.1117/1.JPE.5.057207
Published in: Journal of Photonics for Energy Volume 5, Issue 1
Show Author Affiliations
Nirmal Adhikari, South Dakota State Univ. (United States)
Devendra Khatiwada, South Dakota State Univ. (United States)
Ashish Dubey, South Dakota State Univ. (United States)
Qiquan Qiao, South Dakota State Univ. (United States)


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