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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Effect of Heterocyclic Anchoring Sequence on the Properties of Dithienogermole-Based Solar Cells

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Title
Effect of Heterocyclic Anchoring Sequence on the Properties of Dithienogermole-Based Solar Cells
Author
Walker, Bright JamesHan, DaeheeMoon, MijinPark, Song YiKim, Ka-HyunKim, Jin YoungYang, Changduk
Keywords
bulk heterojunction; dithienogermole; organic electronics; photovoltaic; small molecule; solar cell
Issue Date
201703
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.8, pp.7091 - 7099
Abstract
The synthesis and characterization of two new small molecular donor materials, DTGe(ThFBTTh2)2 and DTGe(FBTTh3)2, are presented for application in organic solar cells. These two materials represent structural evolutions of the high-efficiency, dithienogermole (DTGe)-cored small molecule DTGe(FBTTh2)2, in which the conjugation length in the backbone was extended by incorporating additional thiophene units. Using the same molecular framework, we have evaluated how the anchoring sequence of heterocyclic units influences material properties and function in solar cell devices. It was found that incorporating additional thiophene units into the backbone, regardless of the position in the molecular platform, caused a small reduction in band gaps; however, both highest occupied molecular orbitals and lowest unoccupied molecular orbital energy bands were at lower energies when the thiophenes were incorporated near the terminus of the molecule. The film morphologies of both materials could be controlled by either thermal or solvent vapor annealing to yield phase separation on the order of tens of nanometers and improved crystallinity. Peak power-conversion efficiencies of 3.6% and 3.1% were obtained using DTGe(ThFBTTh2)2 and DTGe(FBTTh3)2, after solvent vapor treatment and thermal annealing, respectively. Our study provides a detailed analysis of how the ordering sequence of heterocyclic building blocks influences the properties and function of organic solar cells.
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DOI
http://dx.doi.org/10.1021/acsami.6b14804
ISSN
1944-8244
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