Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (10): 2401.doi: 10.7503/cjcu20130093

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of Sb2S3 Nanowires and Their Application in Hybrid Solar Cells

ZHANG Hui, WU Fan, HAN Chang-Bao, SHEN Wei, CUI Qi, QIU Ze-Liang, LIU Chang-Wen, GAO Feng, WANG Ming-Tai   

  1. Institute of Plasma Physics, Chinese Academy of Sciences, Key Lab of Novel Thin Film Solar Cells, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2013-01-25 Online:2013-10-10 Published:2013-10-10

Abstract:

High quality Sb2S3 nanowires, which were 60—70 nm in diameter and 4—6 μm in length, were synthesized via a facile solvothermal approach by using L-cysteine(C3H7NO2S) as a capping agent, and applied to hybrid solar cells after blending with poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene)(MEH-PPV). The as-synthesized nanowires were characterized by XRD, SEM, TEM, UV-Vis absorption and PL spectra; the solar cells were investigated by current-voltage(J-V) measurements and incident photon-to-current conversion efficiency(IPCE) spectroscopy. The highly pure Sb2S3 nanowires have a bandgap of 1.57 eV and grow along [001] direction. In comparison with the solar cells without Sb2S3 nanowires, the MEH-PPV/Sb2S3 devices exhibit a much higher Jsc depending on the Sb2S3 concentration and a certain wide spectral response characteristics due to complementary absorption of Sb2S3 nanowires. With addition of the Sb2S3 nanowires into the polymer phase, the MEH-PPV/Sb2S3 interfaces are created for dissociation of the excitons generated in the polymer and the direct channels are formed for electron transport; on the other hand, the defects on the nanowire surface cause the serious charge recombination that is unfavorable for the photocurrent generation. At the Sb2S3/MEH-PPV mass ratio of 5:1, the device with a power conversion efficiency of 0.393% is achieved under AM 1.5 illumination(100 mW/cm2).

Key words: Sb2S3, Nanowires, Solar cell

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