Electro-Optics of Conventional and Inverted Thick Junction Organic Solar Cells

Armin, Ardalan, Yazmaciyan, Aren, Hambsch, Mike, Li, Jun, Burn, Paul L. and Meredith, Paul (2015) Electro-Optics of Conventional and Inverted Thick Junction Organic Solar Cells. ACS Photonics, 2 12: 1745-1754. doi:10.1021/acsphotonics.5b00441

Author Armin, Ardalan
Yazmaciyan, Aren
Hambsch, Mike
Li, Jun
Burn, Paul L.
Meredith, Paul
Title Electro-Optics of Conventional and Inverted Thick Junction Organic Solar Cells
Journal name ACS Photonics   Check publisher's open access policy
ISSN 2330-4022
Publication date 2015-11-25
Year available 2015
Sub-type Article (original research)
DOI 10.1021/acsphotonics.5b00441
Open Access Status Not yet assessed
Volume 2
Issue 12
Start page 1745
End page 1754
Total pages 10
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Bulk heterojunctions continue to be the dominant architecture for solution processed organic solar cells. In general, photoactive films on the order of 100 nm thickness have delivered the highest power conversion efficiencies. However, it is becoming increasingly apparent that thicker junctions are needed for high yield, high throughput, low cost manufacturing of commercial organic solar cells. Very few organic semiconductors are suitable for maintaining optimal efficiencies in cells with thicker junctions. This paradigm is beginning to shift with the recent high mobility donor polymers, where electrically inverted thick heterojunction structures deliver impressive efficiencies. The inverted architecture seems to be an essential feature of these solar cells. The reason for this has yet to be explained, and in this work, we address this question. We present analytical simulations and experimental evidence showing how the charge generation and extraction physics is significantly different in thin and thick heterojunctions, inverted and conventional. In particular, our predictive model shows how the inverted architecture compensates for strongly imbalanced carrier mobilities, which would otherwise cause debilitating recombination. Thick bulk heterojunctions can be designed to deliver high efficiencies, but for high mobility donors, this is only in an inverted architecture. These findings have profound implications for manufacturing of commercial organic solar cells.
Keyword electro-optical properties
inverted solar cells
mobility balances
organic solar cells
thick junctions
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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