Solution-processed photovoltaics with a 3,6-bis(diarylamino)fluoren-9-ylidene malononitrile

Supravat Karak; Paul J Homnick; Lawrence A Renna; D Venkataraman; Joel T Mague; Paul M Lahti

doi:10.1021/am504993j

Solution-processed photovoltaics with a 3,6-bis(diarylamino)fluoren-9-ylidene malononitrile

ACS Appl Mater Interfaces. 2014 Oct 8;6(19):16476-80. doi: 10.1021/am504993j. Epub 2014 Sep 29.

Authors

Supravat Karak¹, Paul J Homnick, Lawrence A Renna, D Venkataraman, Joel T Mague, Paul M Lahti

Affiliation

¹ Department of Chemistry and ‡Department of Polymer Science & Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.

PMID: 25265465
DOI: 10.1021/am504993j

Abstract

3,6-Bis(N,N-dianisylamino)-fluoren-9-ylidene malononitrile (FMBDAA36) was used as an electron donor material in solution-processed organic photovoltaic devices with configuration ITO/PEDOT:PSS/(1:3[w/w] FMBDAA36:PC71BM)/LiF/Al to give power conversion efficiencies up to 4.1% with open circuit voltage VOC = 0.89 V, short circuit current JSC = 10.35 mA cm(-2), and fill factor FF = 44.8%. Conductive atomic force microscopy of the active layer showed granular separation of regions exhibiting easy versus difficult hole transport, consistent with bulk heterojunction type phase separation of FMBDAA36 and PC71BM, respectively. Single-crystal X-ray diffraction analysis showed pure FMBDAA36 to form columnar π-stacks with a 3.3 Å intermolecular spacing.

Keywords: conductive atomic force microscopy; fluorenylidene malononitrile; organic photovoltaics; small molecule photovoltaics; solution-processed solar cells.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.