Increased carrier mobility in end-functionalized oligosilanes
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| Authors: | S Surampudi M-L Yeh M A Siegler J F Martinez Hardigree T A Kasl H E Katz R S Klausen |
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| Institution: | a Department of Chemistry , Johns Hopkins University , 3400 N. Charles St , Baltimore , MD 21218 , USA . Email: ;b Department of Materials Science and Engineering , Johns Hopkins University , 3400 N. Charles St , Baltimore , MD 21218 , USA |
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| Abstract: | We show that a class of oligosilane–arene σ, π-hybrid materials exhibits distinct and enhanced solid-state electronic properties relative to its parent components. In the single crystal structure, the σ-conjugation axis of one molecule points towards the π-face of a neighboring molecule due to an unusual gauche conformation. This organization is hypothesized to be beneficial for charge transport. We show that solution-deposited crystalline films of the hybrid materials show up to a 100-fold increase in space-charge limited current (SCLC) mobility relative to literature reports of photoinduced hole transport in oligosilane films. The discovery that σ, π-hybrids are more than the sum of their parts offers a design opportunity for new materials. |
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