Preparation and Photovoltaic Performance of Reduced Graphene Oxide-CuInS2 Composite

doi:10.7503/cjcu20130953

Abstract

Abstract:

A new type of reduced graphene oxide-CuInS₂(rGO-CuInS₂) composite was successfully synthesized via solvothermal method. The structure of composite was characterized by X-ray diffraction(XRD), Raman, UV-Vis(UV-Vis), photoluminescence(PL) spectra, transmission electron microscopy(TEM) and high-resolution transmission electron microscopy(HRTEM). The results show that CuInS₂ quantum dots, with a size of 3—5 nm, disperses uniformly on the surface of graphene. In addition, the growth mechanism of the composite was also investigated. And, the rGO-CuInS₂ composites with different rGO/CuInS₂ mass ratio were applied in hybrid photovoltaic device. Compared with the power conversion efficiency(η) of the device based on reduced graphene oxide(rGO), the device based on rGO-CuInS₂ composites exhibit higher performance with the highest η of 1.10% when the composite mass ratio is 0.5:1.

Key words: Graphene, CuInS2, Photovoltaic performance, Solvothermal synthesis

CLC Number:

O611.4

TrendMD:

LI Tao, XIA Youfu. Preparation and Photovoltaic Performance of Reduced Graphene Oxide-CuInS₂ Composite[J]. Chem. J. Chinese Universities, 2014, 35(3): 461.

Figures/Tables 9

Fig.1 XRD patterns of rGO(a), CuInS2(b) and rGO-CuInS2(c)

Fig.2 UV-Vis spectra of rGO(a), CuInS2(b) and rGO-CuInS2(c)

Fig.3 Photoluminescence spectra of rGO(a), CuInS2(b) and rGO-CuInS2 composite(c)

Fig.4 Raman spectra of rGO(a) and rGO-CuInS2 composite(b)

Fig.5 TEM(A) and HRTEM(B) images of the rGO-CuInS2 composite

Fig.6 Mechanism of the rGO-CuInS2 formation process

Table 1 Device performance of solar cells under AM 1.5 illumination(100 mW/cm2)

Active layer	V_oc/V	J_sc/(mA·cm^-2)	Fill factor(%)	η(%)
rGO	0.57	2.2	35.3	0.46
rGO-CuInS₂(1:1)	0.59	2.4	35.5	0.49
rGO-CuInS₂(0.5:1)	0.66	3.8	41.7	1.10
rGO-CuInS₂(0.3:1)	0.61	3.3	38.1	0.78

Fig.7 J-V curves of the as-fabricated device based on rGO and rGO-CuInS2 compositea. rGO; b. rGO-CuInS2(0.3:1); c. rGO-CuInS2(0.5:1); d. rGO-CuInS2(1:1).

Fig.8 IPCE spectra of the devices based on rGO and rGO-CuInS2 compositesa. rGO; b. rGO-CuInS2(0.3:1); c. rGO-CuInS2(0.5:1); d. rGO-CuInS2(1:1).

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Preparation and Photovoltaic Performance of Reduced Graphene Oxide-CuInS₂ Composite

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