Investigation on performance enhancement of bulk heterojunction organic solar cells

Meng Chan Su*, Li Xin Yi, Yang Wang, Yumeng Shi, Chun Jun Liang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Four organic solar cells with the different structures were fabricated. The structures are Device l ITO/LiF/PEDOT:PSS/MEH-PPV/C60/Al, Device 2 ITO/PEDOT:PSS/MEH-PPV/C60/Al, Device 3 ITO/LiF/PEDOT:PSS/MEH-PPV:C60/C60/Al and Device 4 ITO/PEDOT:PSS/MEH-PPV:C60/C60/Al. Then we compared the current-voltage (I-V) characteristics of these devices and found that the insertion of a thin LiF layer between the ITO electrode and the PEDOT:PSS layer resulted in much improved device performance. The short-circuit current density (JSC) and fill factor (FF) of Device 1 were enhanced by 74% and 31%, respectively as compared to those of Device 2. The short-circuit current density (JSC) of Device 3 is about 1.4 times as large as that of Device 4. The increased solar cell performance mostly can be attributed to the fact that the hole transport to the anode can be effectively suppressed by a thin LiF layer, and the thin LiF layer between the ITO electrode and the PEDOT: PSS layer can form better interface properties. Hence, such change in structure of solar cells improves the performance of the organic solar cells effectively.

Original languageEnglish (US)
Pages (from-to)740-744
Number of pages5
JournalGuang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Volume28
Issue number4
StatePublished - Apr 1 2008

Keywords

  • Bulk heterojunctions
  • Fill factor (FF)
  • LiF
  • Open-circuit voltage (V)
  • Organic solar cell
  • Short-circuit current density (J)

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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