The intermolecular charge transfer integral as an indicator of future success in organic photovoltaics
(Conference Presentation)

Christopher J. Collison; Chenyu Zheng; Nicholas J. Hestand; Ishita Jalan; Jeremy A. Cody; Frank C. Spano

doi:10.1117/12.2238062

2 November 2016 The intermolecular charge transfer integral as an indicator of future success in organic photovoltaics (Conference Presentation)

Christopher J. Collison, Chenyu Zheng, Nicholas J. Hestand, Ishita Jalan, Jeremy A. Cody, Frank C. Spano

Author Affiliations +

Proceedings Volume 9942, Organic Photovoltaics XVII; 99420L (2016) https://doi.org/10.1117/12.2238062
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

In recent years, higher power conversion efficiencies have been measured using "push-pull" or Donor-Acceptor (D-A) type compounds designed to specifically address bandgap and energy level requirements. Yet, a strong prescription is fundamentally lacking that improves materials for the set of all critical properties (including exciton diffusion rate and charge transport/ mobility) that combine to provide optimal performance. We will present our newest theoretical models that simulate the morphology-based spectroscopy for a series of squaraines, compounds representative of the total set of D-A type OPV-targets. The theory will describe how morphological and molecular structure influences i) the absorption spectrum, ii) the excited states and iii) the intermolecular charge transfer integral (ICTI). In particular, the ICTI's role in exciton diffusion and carrier mobility will be explored. Using device data that correlates with the ICTI variation, we will explain how this parameter must be considered in future design of new easily-purified, consistently processable, low-band-gap small molecules targeted for large scale OPV manufacture.

Conference Presentation

Citation Download Citation

Christopher J. Collison, Chenyu Zheng, Nicholas J. Hestand, Ishita Jalan, Jeremy A. Cody, and Frank C. Spano "The intermolecular charge transfer integral as an indicator of future success in organic photovoltaics (Conference Presentation)", Proc. SPIE 9942, Organic Photovoltaics XVII, 99420L (2 November 2016); https://doi.org/10.1117/12.2238062

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KEYWORDS

Organic photovoltaics

Diffusion

Excitons

Absorption

Energy efficiency

Manufacturing

Molecules

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