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Issue 24, 2013
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Enhanced photoresponse in curled graphene ribbons

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Graphene has become one of the most promising materials for future optoelectronics due to its ultrahigh charge-carrier mobility, high light transmission, and universal absorbance in the near-infrared and visible spectral ranges. However, a zero band gap and ultrafast recombination of the photoexcited electron–hole pairs limit graphene's potential in photovoltaic generation. Recent studies have shown that hot carriers can enhance photovoltaic generation in graphene p–n junctions through the photothermoelectric effect (PTE). It is, therefore, desirable to synthesize graphene nanostructures with an intrinsic PTE-induced photocurrent response. Here we report a simple method to synthesize quasi-one dimensional (quasi-1D) curled graphene ribbons (CGRs) that generate a photocurrent response with two orders of magnitude enhancement. Scanning photocurrent and photoluminescence measurements reveal that the photocurrent response is primarily attributed to the PTE and that the infrared emission may arise from thermal radiation. These results offer a new way to fabricate graphene-based optoelectronics with an enhanced photoresponse.

Graphical abstract: Enhanced photoresponse in curled graphene ribbons

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Publication details

The article was received on 31 Jul 2013, accepted on 14 Sep 2013 and first published on 23 Sep 2013

Article type: Paper
DOI: 10.1039/C3NR03988A
Nanoscale, 2013,5, 12206-12211

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    Enhanced photoresponse in curled graphene ribbons

    Z. Jarrahi, Y. Cao, T. Hong, Y. S. Puzyrev, B. Wang, J. Lin, A. H. Huffstutter, S. T. Pantelides and Y. Xu, Nanoscale, 2013, 5, 12206
    DOI: 10.1039/C3NR03988A

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