Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 16, Pages 8770-8780Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b01621
Keywords
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Funding
- National Science Foundation [1455167, OIA 1539035]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1455167] Funding Source: National Science Foundation
- Office of Integrative Activities
- Office Of The Director [1539035] Funding Source: National Science Foundation
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A novel organic sensitizer (AP3) with dual donors and dual anchor-acceptors based on an electron deficient thieno[3,4-b]pyrazine (TPz) pi-bridge was synthesized, which shows an impressively high J(sc) of 17.6 mA/cm(2) when cosensitized with D35 (12.4 mA/cm(2) as a single dye). Device power conversion efficiencies were observed at 7.5% under full sun intensity and in excess of 10% under reduced sun intensity. This novel dye design approach allows for devices showing photostability beyond 500 h for continuous irradiation and a tunable dye structure with an incident power conversion efficiency breadth reaching 800 nm from a simple-to-synthesize organic dye. Dye characterization with cyclic voltammetry, solution and film absorption, and computational analysis are all presented. Additionally, device characterization was performed through IV curves, IPCE, electron lifetime measurements, transient absorption spectroscopy, and current dynamic measurements at varying sun intensities to better understand the origin of the high device power conversion efficiencies as well as the interactions of AP3 and D35 in DSC devices.
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