Organic Salts as a Route to Energy Level Control in Low Bandgap, High Open-Circuit Voltage Organic and Transparent Solar Cells that Approach the Excitonic Voltage Limit

John Suddard-Bangsund, Christopher J. Traverse, Margaret Young, Tyler J. Patrick, Yimu Zhao, Richard R. Lunt

Research output: Contribution to journalArticle

  • 8 Citations

Abstract

A new series of organic salts with selective near-infrared (NIR) harvesting to 950 nm is reported, and anion selection and blending is demonstrated to allow for fine tuning of the open-circuit voltage. Extending photoresponse deeper into the NIR is a significant challenge facing small molecule organic photovoltaics, and recent demonstrations have been limited by open-circuit voltages much lower than the theoretical and practical limits. This work presents molecular design strategies that enable facile tuning of energy level alignment and open-circuit voltages in organic salt-based photovoltaics. Anions are also shown to have a strong influence on exciton diffusion length. These insights provide a clear route toward achieving high efficiency transparent and panchromatic photovoltaics, and open up design opportunities to rapidly tailor molecules for new donor-acceptor systems.

LanguageEnglish (US)
Article number1501659
JournalAdvanced Energy Materials
Volume6
Issue number1
DOIs
StatePublished - Jan 7 2016

Profile

Level control
Open circuit voltage
Power control
Electron energy levels
Solar cells
Energy gap
Salts
Anions
Electric potential
Negative ions
Tuning
Infrared radiation
Molecules
Excitons
Demonstrations

Keywords

  • energy level tuning
  • near-infrared solar harvesting
  • open-circuit voltage
  • organic salts
  • transparent solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Organic Salts as a Route to Energy Level Control in Low Bandgap, High Open-Circuit Voltage Organic and Transparent Solar Cells that Approach the Excitonic Voltage Limit. / Suddard-Bangsund, John; Traverse, Christopher J.; Young, Margaret; Patrick, Tyler J.; Zhao, Yimu; Lunt, Richard R.

In: Advanced Energy Materials, Vol. 6, No. 1, 1501659, 07.01.2016.

Research output: Contribution to journalArticle

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