Solution-Processed Photovoltaics with a 3,6-Bis(diarylamino)fluoren-9-ylidene Malononitrile

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• 作者：Supravat Karak ; Paul J. Homnick ; Lawrence A. Renna ; D. Venkataraman ; Joel T. Mague ; Paul M. Lahti
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：6
• 期：19
• 页码：16476-16480
• 全文大小：389K
• ISSN：1944-8252

文摘

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 V_OC = 0.89 V, short circuit current J_SC = 10.35 mA cm^鈥?, 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 蟺-stacks with a 3.3 脜 intermolecular spacing.

Keywords:

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