Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 36, Pages 11833-11839Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b06291
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Funding
- Office of Naval Research [N00014-14-1-0246]
- National Science Foundation [DMR-1608279]
- Asian Office of Aerospace RD [FA2386-15-1-4106]
- Department of Energy SunShot [DEEE0006710]
- Boeing-Johnson Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1608279] Funding Source: National Science Foundation
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In this paper, an electron donor-acceptor (D-A) substituted dipolar chromophore (BTPA-TCNE) is developed to serve as an efficient dopant-free hole-transporting material (HTM) for perovskite solar cells (PVSCs). BTPA-TCNE is synthesized via a simple reaction between a triphenylamine-based Michler's base and tetracyanoethylene. This chromophore possesses a zwitterionic resonance structure in the ground state, as evidenced by X-ray crystallography and transient absorption spectroscopies. Moreover, BTPA-TCNE shows an antiparallel molecular packing (i.e., centrosymmetric dimers) in its crystalline state, which cancels out its overall molecular dipole moment to facilitate charge transport. As a result, BTPA-TCNE can be employed as an effective dopant-free HTM to realize an efficient (PCE approximate to 17.0%) PVSC in the conventional n-i-p configuration, outperforming the control device with doped spiro-OMeTAD HTM.
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