Key Tradeoffs Limiting the Performance of Organic Photovoltaics

Ramirez, Ivan; Causa, Martina; Zhong, Yufei; Banerji, Natalie; Riede, Moritz (2018). Key Tradeoffs Limiting the Performance of Organic Photovoltaics. Advanced energy materials, 8(28), p. 1703551. Wiley 10.1002/aenm.201703551

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2017 saw the publication of several new material systems that challenge the long-held notion that a driving force is necessary for efficient exciton dissocia-tion in organic photovoltaics (OPVs) and that a loss of ≈0.6 eV between the energy of the charge transfer state Ect and the energy corresponding to open circuit is general. In light of these developments, the authors combine insights from device physics and spectroscopy to review the two key tradeoffs limiting OPV performances. These are the tradeoff between the charge carrier generation efficiency and the achievable open circuit voltage (Voc) and the tradeoff between device thickness (light absorption) and fill factor. The emergence of several com-petitive nonfullerene acceptors (NFAs) is exciting for both of these. The authors analyze what makes these materials compare favorably to fullerenes, including the potential role of molecular vibrations, and discuss both design criteria for new molecules and the achievable power conversion efficiencies.

Item Type:

Journal Article (Review Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Causa, Martina and Zhong, Yufei

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1614-6832

Publisher:

Wiley

Language:

English

Submitter:

Gareth John Moore

Date Deposited:

28 Nov 2018 10:42

Last Modified:

24 Oct 2019 13:06

Publisher DOI:

10.1002/aenm.201703551

BORIS DOI:

10.7892/boris.121528

URI:

https://boris.unibe.ch/id/eprint/121528

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