ITO surface modification for inverted organic photovoltaics

doi:10.1007/s12200-015-0531-x

Front. Optoelectron.

2015, Vol. 8

Issue (3) : 269-273 https://doi.org/10.1007/s12200-015-0531-x

RESEARCH ARTICLE

ITO surface modification for inverted organic photovoltaics

Mingzhang DENG,Weina SHI,Chen ZHAO,Bingbing CHEN,Yan SHEN(

)

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

The work function (WF) of indium-tin-oxide (ITO) substrates plays an important role on the inverted organic photovoltaic device performance. And electrode engineering has been a useful method to facilitate carrier extraction or charge collection to enhance organic photovoltaic (OPV) performance. By using self-assembly technique, we have deposited poly(dimethyl diallylammonium chloride) (PDDA) layers onto ITO coated glass substrates. The results indicate that the surface WF of ITO is reduced by about 0.3 eV after PDDA modification, which is attributed to the modulation in electron affinity. In addition, the surface roughness of ITO substrate became smaller after PDDA modification. These modified ITO substrates can be applied to fabricate inverted OPVs, in which ITO works as the cathode to collect electrons. As a result, the photovoltaic performance of inverted OPV is substantially improved, mainly reflecting on the increase of short circuit current density.

Keywords organic photovoltaic (OPV) indium tin oxide (ITO) inverted structure surface modification work function (WF)

Corresponding Author(s): Yan SHEN

Just Accepted Date: 04 August 2015 Online First Date: 08 September 2015 Issue Date: 18 September 2015

Cite this article:

Mingzhang DENG,Weina SHI,Chen ZHAO, et al. ITO surface modification for inverted organic photovoltaics[J]. Front. Optoelectron., 2015, 8(3): 269-273.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-015-0531-x
https://academic.hep.com.cn/foe/EN/Y2015/V8/I3/269

Fig.1 Surface modification of ITO glass substrates with PDDA through electrostatic interaction

Fig.2 AFM images of ITO surface with and without PDDA: (a) and (b) are 2D and 3D AFM images of pristine ITO; (c) and (d) are 2D and 3D AFM images of ITO surface after PDDA modification

Fig.3 Cut-off region in UPS spectrum of ITO modified with and without PDDA in kinetic energy scale

Fig.4 Structure for an inverted organic photovoltaic device using the PDDA modified ITO glass substrate

Tab.1 Photovoltaic performance of the organic solar cell device using ITO with and without PDDA modification

Fig.5 I-V curves of organic solar cell devices using ITO modified without/with PDDA

Fig.6 Energy levels in the organic solar cell using ITO modified without/with PDDA

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