Gupta,, Vinay and Kyaw, Aung Ko Ko and Wang, Dong Hwan and Chand, Suresh and Bazan, Guillermo C. and Heeger, Alan J.
(2013)
Barium: An Efficient Cathode Layer for Bulk-heterojunction Solar Cells.
Scientific Reports, 3.
pp. 1965-1970.
ISSN 2045-2322
Abstract
We report Barium (Ba) cathode layer for bulk-heterojunction solar cells which enhanced the fill factor (FF) of p-DTS(FBTTh2)(2)/PC71BM BHJ solar cell up to 75.1%, one of the highest value reported for an organic solar cell. The external quantum efficiency exceeds 80%. Analysis of recombination mechanisms using the current-voltage (J-V) characteristics at various light intensities in the BHJ solar cell layer reveals that Ba prevents trap assisted Shockley-Read-Hall (SRH) recombination at the interface and with different thicknesses of the Ba, the recombination shifts towards bimolecular from monomolecular. Moreover, Ba increases shunt resistance and decreases the series resistance significantly. This results in an increase in the charge collection probability leading to high FF. This work identifies a new cathode interlayer which outclasses the all the reported interlayers in increasing FF leading to high power conversion efficiency and have significant implications in improving the performance of BHJ solar cells.
| Item Type: |
Article
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| Additional Information: |
copyright for this article belongs to M/s Nature Publishing Group |
| Subjects: |
Multidisciplinary |
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UNSPECIFIED |
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| Date Deposited: |
19 Aug 2026 10:41 |
| Last Modified: |
19 Aug 2026 10:41 |
| URI: |
https://npl.csircentral.net/id/eprint/3332 |
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