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Work function engineering of graphene electrode via chemical doping.

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¹School of Materials Science and Engineering, Nanyang Technological University 50, Nanyang Avenue, Singapore.

|May 4, 2010

Summary

Graphene films made using chemical vapor deposition (CVD) can be tuned for use in transparent electrodes. Doping graphene with gold nanoparticles significantly boosts photovoltaic device efficiency.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Graphene synthesized via chemical vapor deposition (CVD) offers unique electronic properties.
Transparent electrodes are crucial components in various electronic devices, including solar cells.
Tuning the work function of electrode materials is essential for optimizing device performance.

Purpose of the Study:

To demonstrate the use of CVD-grown graphene films as transparent electrodes with tunable work function.
To investigate the effect of gold nanoparticle decoration on graphene's surface potential.
To evaluate the performance enhancement of photovoltaic devices utilizing these modified graphene electrodes.

Main Methods:

Graphene films were synthesized using the chemical vapor deposition (CVD) method.

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Gold nanoparticles were formed on graphene surfaces by immersing CVD-grown films in an AuCl(3) solution.

The surface potential of graphene films was adjusted by controlling immersion time.

Photovoltaic devices were fabricated using n-type silicon and the modified graphene electrodes.

Main Results:

Gold particles were successfully formed on CVD-graphene films through spontaneous reduction.
The surface potential of graphene films was tunable by up to approximately 0.5 eV based on immersion duration.
Photovoltaic devices incorporating the tunable work function graphene electrodes showed a significant increase in power conversion efficiency (PCE).
The maximum PCE achieved was approximately 0.08%, over 40 times higher than undoped devices.

Conclusions:

CVD-graphene films functionalized with gold nanoparticles serve as effective transparent electrodes with adjustable work functions.
The work function tunability of graphene electrodes directly enhances the performance of photovoltaic devices.
This approach offers a promising method for developing efficient and cost-effective transparent electrodes for optoelectronic applications.