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Title: Graphene intermediate layer in tandem organic photovoltaic cells
Authors: Tong, S.W. 
Wang, Y. 
Zheng, Y. 
Ng, M.-F.
Loh, K.P. 
Keywords: Graphene
intermediate layer
molybdenum oxide
tandem photovoltaic cells
Issue Date: 6-Dec-2011
Citation: Tong, S.W., Wang, Y., Zheng, Y., Ng, M.-F., Loh, K.P. (2011-12-06). Graphene intermediate layer in tandem organic photovoltaic cells. Advanced Functional Materials 21 (23) : 4430-4435. ScholarBank@NUS Repository.
Abstract: One strategy to harvest wide spectral solar energy is to stack different bandgap materials together in a tandem solar cell. Here, it is demonstrated that CVD grown graphene film can be employed as intermediate layer (IML) in tandem solar cells. Using MoO3-modified graphene IML, a high open circuit voltage (Voc) of 1 V and a high short-circuit current density (J sc) of 11.6 mA cm-2 could be obtained in series and parallel connection, respectively, in contrast to a Voc of 0.58 V and Jsc of 7.6 mA cm-2 in single PV cell. The value of V oc (Jsc) in the tandem cell is very close to the sum of Voc (Jsc) attained from two single subcells in series (parallel), which confirms good ohmic contact at the photoactive layer/MoO 3-modified graphene interface. Work function engineering of the graphene IML with metal oxide is essential to ensure good charge collection from both subcells. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Advanced Functional Materials
ISSN: 1616301X
DOI: 10.1002/adfm.201101376
Appears in Collections:Staff Publications

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