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Title: Efficient bulk heterojunction photovoltaic devices based on diketopyrrolopyrrole containing small molecule as donor and modified PCBM derivatives as electron acceptors
Authors: Sharma G.D.
Mikroyannidis J.A.
Sharma S.S.
Roy M.S.
Justin Thomas, K. R.
Published in: Organic Electronics
Abstract: A new solution processable small molecule (DPP-CN) containing electron donor diketopyrrolopyrrole (DPP) core and cyanovinylene 4-nitrophenyl (CN) electron acceptor has synthesized for use as the donor material in the bulk heterojunction organic solar cells along with PCBM, modified PCBM i.e. F and A as electron acceptor. It showed a broad absorption in longer wavelength region having optical band gap around 1.64 eV. We have used PCBM, F and A as electron acceptor for the fabrication of bulk heterojunction photovoltaic devices. The power conversion efficiency (PCE) of the BHJ devices based on DPP-CN:PCBM, DPP-CN:F and DPP-CN:A blends cast from the THF solvent is 1.83%, 2.79% and 2.83%, respectively. The increase in the PCE based on F and A as electron acceptor is mainly due to the increase in both short circuit current (J sc) and open circuit voltage (Voc). The PCE value of the photovoltaic devices based on the blends DPP-CN:PCBM, DPP-CN:F and DDP-CN:A cast from the mixed solvents (DIO/THF) has been further improved up to 2.40%, 3.32% and 3.34%, respectively. This improvement is mainly due to the increased value of Jsc, which is attributed not only to the increase of crystallinity, but also to the morphological change in the film cast from mixed solvent. Finally, the device ITO/PEDOT:PSS/DPP-CN:A (DIO/THF cast)/TiO 2/Al device shows a PCE of 3.9%. The improved device performance could be attributed to the electron transporting and hole-blocking capabilities due to the introduced TiO2 buffer layer. © 2012 Elsevier B.V. All rights reserved.
Citation: Organic Electronics (2012), 13(4): 652-666
Issue Date: 2012
Publisher: Elsevier B.V.
Keywords: Bulk heterojunction
Diketopyrrolopyrrole small molecule
Modified PCBM
Photovoltaic devices
ISSN: 15661199
Author Scopus IDs: 55549519200
Author Affiliations: Sharma, G.D., Physics Department, Molecular Electronic and Optoelectronic Device Laboratory, JNV University, Jodhpur, Rajasthan 342005, India, R and D Center for Science and Engineering, Jaipur Engineering College, Kukas, Jaipur, Rajasthan, India
Mikroyannidis, J.A., Chemical Technology Laboratory, Department of Chemistry, University of Patras, GR-26500 Patras, Greece
Sharma, S.S., Department of Engineering Physics, Govt. Engineering College for Women, Ajmer, Rajasthan, India
Roy, M.S., Defence Laboratory, Jodhpur, Rajasthan, India
Justin Thomas, K.R., Organic Materials Lab, Department of Chemistry, Indian Institute of Technology, Roorkee, Uttrakhand, India
Corresponding Author: Sharma, G.D.; Physics Department, Molecular Electronic and Optoelectronic Device Laboratory, JNV University, Jodhpur, Rajasthan 342005, India; email:
Appears in Collections:Journal Publications [CY]

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