A highly efficient PTB7-Th polymer donor bulk hetero-junction solar cell with increased open circuit voltage using fullerene acceptor CN-PC70BM

P. Nagarjuna, Anirban Bagui, Vinay Gupta, Surya Prakash Singh

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Modified [6,6]-phenyl-C70-butyric acid methyl ester (CN-PC70BM) is employed as an electron acceptor along with poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b; 4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th) polymer as donor for solution-processed organic solar cells. Inverted device architecture is adopted to fabricate the photovoltaic devices. Using chloronaphthalene as an additive, a high power conversion efficiency (PCE) of 8.2% is achieved with an excellent open circuit voltage (Voc) of 0.9 V, short-circuit current density (Jsc) of 13.5 mA cm−2 and fill factor of 0.68 as compared to PCE of 5.4% from the reference solar cell using PC70BM.

Original languageBritish English
Pages (from-to)262-267
Number of pages6
JournalOrganic Electronics
Volume43
DOIs
StatePublished - 1 Apr 2017

Keywords

  • Additive
  • High open circuit voltage
  • High power conversion efficiency
  • Modified fullerene acceptor
  • Organic solar cells
  • PTB7-Th polymer donor

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