DataVXACS Energy LettersPaper
journal article·2021-02-12Open access

Excitons Dominate the Emission from PM6:Y6 Solar Cells, but This Does Not Help the Open-Circuit Voltage of the Device

Lorena Perdigón-Toro, Le Quang Phuong, Stefan Zeiske, Koen Vandewal, Ardalan Armin, Safa Shoaee, Dieter Neher

ACS Energy Letters· Volume 6· Issue 2
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Source abstract

Abstract

Non-fullerene acceptors (NFAs) are far more emissive than their fullerene-based counterparts. Here, we study the spectral properties of photocurrent generation and recombination of the blend of the donor polymer PM6 with the NFA Y6. We find that the radiative recombination of free charges is almost entirely due to the re-occupation and decay of Y6 singlet excitons, but that this pathway contributes less than 1% to the total recombination. As such, the open-circuit voltage of the PM6:Y6 blend is determined by the energetics and kinetics of the charge-transfer (CT) state. Moreover, we find that no information on the energetics of the CT state manifold can be gained from the low-energy tail of the photovoltaic external quantum efficiency spectrum, which is dominated by the excitation spectrum of the Y6 exciton. We, finally, estimate the charge-separated state to lie only 120 meV below the Y6 singlet exciton energy, meaning that this blend indeed represents a high-efficiency system with a low energetic offset.
Source: openalex_inverted_index · Quality: baseline

Research context

PolymersElectronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · solar cell performance optimization · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Soft Matter Physics and Optoelectronics, Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam-Golm, Germany

Optoelectronics of Disordered Semiconductors, Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam-Golm, Germany

Sustainable Advanced Materials (Sêr SAM), Department of Physics, Swansea University, Singleton Park, Swansea SA2 8PP U.K.

Instituut voor Materiaalonderzoek (IMO-IMOMEC), Hasselt University, Wetenschapspark 1, BE-3590 Diepenbeek, Belgium

Funding

Alexander von Humboldt-Stiftung · European Research Council · S?r Cymru II Program through the Welsh Government, the European Regional Development Fund, Welsh European Funding Office and Swansea University strategic initiative in Sustainable Advanced Materials

References (40)

Show source-provided references
1. 10.1016/j.scib.2020.01.00110.1016/j.scib.2020.01.001 ↗
2. 10.1002/pip.330310.1002/pip.3303 ↗
3. 10.1002/aenm.20200178810.1002/aenm.202001788 ↗
4. 10.1038/s41563-018-0128-z10.1038/s41563-018-0128-z ↗
5. 10.1038/s41467-020-19029-910.1038/s41467-020-19029-9 ↗
6. 10.1038/nmat506310.1038/nmat5063 ↗
7. 10.1038/s41467-020-17867-110.1038/s41467-020-17867-1 ↗
8. 10.1103/PhysRevX.8.03105510.1103/PhysRevX.8.031055 ↗
9. 10.1021/jacs.9b0146510.1021/jacs.9b01465 ↗
10. 10.1038/s41560-020-00684-710.1038/s41560-020-00684-7 ↗
11. 10.1002/adma.20190676310.1002/adma.201906763 ↗
12. 10.1002/aenm.20190423410.1002/aenm.201904234 ↗
13. 10.1002/adma.20190386810.1002/adma.201903868 ↗
14. 10.1038/s41563-020-00835-x10.1038/s41563-020-00835-x ↗
15. 10.1038/ncomms1542110.1038/ncomms15421 ↗
16. 10.1038/s41467-018-05987-810.1038/s41467-018-05987-8 ↗
17. 10.1002/aenm.20200182810.1002/aenm.202001828 ↗
18. 10.1103/PhysRevB.76.08530310.1103/PhysRevB.76.085303 ↗
19. 10.1038/s41563-019-0324-510.1038/s41563-019-0324-5 ↗
20. 10.1021/acs.jpclett.9b0271910.1021/acs.jpclett.9b02719 ↗
21. 10.3390/molecules2518411810.3390/molecules25184118 ↗
22. 10.1038/s41467-020-19332-510.1038/s41467-020-19332-5 ↗
23. 10.1002/cplu.20200008210.1002/cplu.202000082 ↗
24. 10.1002/aenm.20160175010.1002/aenm.201601750 ↗
25. 10.1021/acs.jpcc.9b0890110.1021/acs.jpcc.9b08901 ↗
26. 10.1002/solr.20200064910.1002/solr.202000649 ↗
27. 10.1038/s41467-020-19434-010.1038/s41467-020-19434-0 ↗
28. 10.1038/s41467-018-07707-810.1038/s41467-018-07707-8 ↗
29. Würfel P. · 200510.1002/9783527618545 ↗
30. 10.1016/j.joule.2019.01.00410.1016/j.joule.2019.01.004 ↗
31. 10.1039/D0EE01338B10.1039/D0EE01338B ↗
32. 10.1126/science.aaf059010.1126/science.aaf0590 ↗
33. 10.1088/2040-8978/18/2/02400710.1088/2040-8978/18/2/024007 ↗
34. 10.1103/PhysRevB.84.07521010.1103/PhysRevB.84.075210 ↗
35. 10.1002/aenm.20150172110.1002/aenm.201501721 ↗
36. 10.1002/solr.20190018410.1002/solr.201900184 ↗
37. Gillett A. J. · arXiv Preprint · 2020 · arXiv:2010.1097
38. 10.1002/solr.20200049810.1002/solr.202000498 ↗
39. 10.1002/adma.20190221010.1002/adma.201902210 ↗
40. 10.1021/acsenergylett.0c0060410.1021/acsenergylett.0c00604 ↗