Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Characterization of Phenothiazine-Isoindigo Copolymers for Photovoltaic Applications

  • Lyu, Fuzhen (Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University) ;
  • Park, Hanok (Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University) ;
  • Lee, Soo-Hyoung (Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University) ;
  • Lee, Youn-Sik (Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University)
  • Received : 2013.12.25
  • Accepted : 2014.02.19
  • Published : 2014.06.20
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Abstract

Keywords

Experimental

Synthesis. Synthetic procedures for compound 1-3, PPT-II, and PPT-T-II are described in the supporting information.

Measurements. Instruments employed for characterization of the polymers are described in the supporting information.

Fabrication of the Photovoltaic Device. Photovoltaic devices were fabricated with the configuration of ITO/PEDOT:PSS/PPT-II: PC71BM/LiF/Al (active area of 9 mm2). Patterned ITO glasses (2 × 2 cm) were cleaned ultrasonically in DI water, acetone and isopropyl alcohol, and then treated with UV light and ozone. PEDOT:PSS was spin-coated onto the ITO glass and dried at 90 °C for 20 min under nitrogen. A blend of PPT-II and PC71BM in o-dichlorobenzene was spin-coated onto the PEDOT: PSS layer for 40 s at 700 rpm. LiF (0.5 nm) and Al (100 nm) layers were deposited via thermal evaporation under vacuum (1 × 10−6 torr). The current density-voltage (J-V) characteristics of photovoltaic devices were measured in the dark and in white light illumination using an AM 1.5G solar simulator (Newport) at 100 mW/cm2, adjusted with a standard PV reference cell, (2 × 2 cm monocrystalline silicon solar cell calibrated at NREL, Color-ado, USA) with a Keithley 2400 source-measurement unit. The external quantum efficiency (EQE) was measured using a Polaronix K3100 spectrometer.

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