Journal article
Achieving 6.7% Efficiency in P3HT/Indene-C70 Bisadduct Solar Cells through the Control of Vertical Volume Fraction Distribution and Optimized Regio-Isomer Ratios
- Abstract:
- Indene C60 and C70 bisadducts (IC60BA and IC70BA) have relatively high lowest unoccupied molecular orbital energies. In poly(3-hexylthiophene) (P3HT)-based polymer solar cells (PSCs), this produces an increase in open-circuit voltage (VOC) and power conversion efficiency (PCE). However, ICBA synthesis produces a mixture of regio-isomers with different indene spatial orientations (2, 5, and 12 o'clock) that alter the IC70BA molecular packing when mixed with P3HT. In this paper, how the IC70BA regio-isomerism affects the PSC performance is examined by investigating the molecular packing of P3HT:IC70BA layers with different regio-isomeric ratios. For the first time, non-destructive spectroscopic ellipsometry is used to investigate the effect of the fabrication conditions on the P3HT/IC70BA vertical volume fraction distribution and the results are attributed to the spatial arrangement of the regio-isomers. It is demonstrated that this unambiguously affects the PSC performance. As a result, record device efficiencies are repeatedly attained for standard architecture P3HT:IC70BA PSCs with photoactive areas of 0.43 cm2, achieving 5.9 (±0.4)% PCE (n = 15). With control of the IC70BA constituent, device PCEs vary from below 2.2% to peak values above 6.7%, among the highest recorded PCEs for a P3HT combination, highlighting the importance of the molecular phase separation for high-efficiency devices.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Accepted manuscript, pdf, 881.2KB, Terms of use)
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- Publisher copy:
- 10.1002/aelm.201600362
Authors
+ European Research Council
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- Grant:
- FP7 SMARTONICS (Grant Agreement Number 310229
- Publisher:
- Wiley
- Journal:
- Advanced Electronic Materials More from this journal
- Volume:
- 2
- Issue:
- 12
- Pages:
- 1600362
- Publication date:
- 2016-11-15
- Acceptance date:
- 2016-10-05
- DOI:
- ISSN:
-
2199-160X
- Keywords:
- Pubs id:
-
pubs:660158
- UUID:
-
uuid:57be9da9-e686-49e7-af0d-bbf8a992d601
- Local pid:
-
pubs:660158
- Source identifiers:
-
660158
- Deposit date:
-
2016-11-21
- ARK identifier:
Terms of use
- Copyright holder:
- Wiley VCH Verlag
- Copyright date:
- 2016
- Notes:
- © 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim. This is the accepted manuscript version of the article. The final version is available online from Wiley at: [10.1002/aelm.201600362]
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