Abstract—Fundamentally, the overall power conversion efficiency of bulk heterojunction organic photovoltaic (OPV) solar cell depends on two key parameters: (a) the introduction of diverse organic materials as well as their miscellaneous combination as donor and acceptor in the active layer, and (b) the application of ameliorated solar cell device architecture. Here, we demonstrate a different structural design of an organic solar cell device, named textured OPV cell, which offers opportunities to enrich the value of major efficiency parameters, i.e., absorption efficiency, exciton diffusion efficiency, and charge collection efficiency. The proposed redesigned solar cell device structure has several advantages: (i) it absorbs more sunlight and hence creates more photoexcitons, (ii) it virtually increases the active layer thickness that amplifies absorption efficiency, (iii) it increases the distance between exciton generation site and dissociation site and therefore boosts exciton diffusion efficiency, and (iii) it partially effects charge collection efficiency by creating a percolating pathway for the hole and electron transporting phase to the corresponding electrodes. An analytical analysis shows that the proposed device model increases the absorption efficiency about 11-13%, exciton diffusion efficiency about 10% and these changes offer an increment in the overall power conversion efficiency by about 15-20%.
Index Terms—Absorption efficiency, exciton diffusion efficiency, charge collection efficiency.
A. Haque is with the Dept. at North South University, Dhaka, Bangladesh(e-mail: Ariful.haque@ ieee.org).
A. Haque is with the Dept. at North South University, Dhaka, Bangladesh (e-mail: Ariful.haque@ ieee.org).
F. Sultana was with the North South University, Dhaka, Bangladesh (e-mail: jasima@live.com).
M. A. Awal is with the Electrical Engineering and Computer Science Department, North South University, Dhaka, Bangladesh (e-mail: author@nrim.go.jp).
M. Rahman was with the Electrical Engineering and Computer Science Department, North South University, Dhaka, Bangladesh (e-mail: author@nrim.go.jp). Now, he is on leave with the Agency for Science, Technology and Research (A*STAR), National University of Singapore.
Cite: A. Haque, F. Sultana, M. A. Awal, and M. Rahman, "Efficiency Improvement of Bulk Heterojunction Organic Photovoltaic Solar Cell through Device Architecture Modification," International Journal of Engineering and Technology vol. 4, no. 5, pp. 567-572, 2012.
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