Title
Dependence of recombination mechanisms and strength on processing conditions in polymer solar cells
Campus Units
Electrical and Computer Engineering, Mechanical Engineering
Document Type
Article
Publication Version
Published Version
Publication Date
2011
Journal or Book Title
Applied Physics Letters
Volume
99
Issue
26
First Page
263301
DOI
10.1063/1.3671999
Abstract
Charge carrier recombination due to carrier trapping is not often considered in polymer based solar cells, except in those using non-fullerene acceptors or new donor polymers with limited short-range order. However, we show that even for the canonical poly(3-hexylthiophene): phenyl-C61-butyric acid methyl ester (P3HT:PCBM) system, relative strengths of bimolecular and trap-assisted recombination are strongly dependent on processing conditions. For slow-grown active-layers, bimolecular recombination is indeed the major loss mechanism under one sun illumination. However, for fast-grown active-layers, trap-assisted recombination dominates over bimolecular recombination by an order of magnitude, and recombination strength at short-circuit condition is 3-4 times higher, leading to loss of photocurrent and lowering of fill factor.
Copyright Owner
American Institute of Physics
Copyright Date
2011
Language
en
File Format
application/pdf
Recommended Citation
Nalwa, Kanwar S.; Kodali, Hari K.; Ganapathysubramanian, Baskar; and Chaudhary, Sumit, "Dependence of recombination mechanisms and strength on processing conditions in polymer solar cells" (2011). Mechanical Engineering Publications. 222.
https://lib.dr.iastate.edu/me_pubs/222
Included in
Acoustics, Dynamics, and Controls Commons, Mechanics of Materials Commons, Polymer and Organic Materials Commons, Power and Energy Commons
Comments
This article is published as Nalwa, Kanwar S., Hari K. Kodali, Baskar Ganapathysubramanian, and Sumit Chaudhary. "Dependence of recombination mechanisms and strength on processing conditions in polymer solar cells." Applied Physics Letters 99, no. 26 (2011): 279. DOI:10.1063/1.3671999. Posted with permission.