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Graphene Intermediate Layer in Tandem Organic Photovoltaic Cells
Author(s) -
Tong Shi Wun,
Wang Yu,
Zheng Yi,
Ng ManFai,
Loh Kian Ping
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201101376
Subject(s) - materials science , graphene , tandem , ohmic contact , optoelectronics , photoactive layer , photovoltaic system , organic solar cell , band gap , solar cell , oxide , stack (abstract data type) , work function , equivalent series resistance , graphene nanoribbons , layer (electronics) , open circuit voltage , polymer solar cell , nanotechnology , voltage , composite material , electrical engineering , engineering , computer science , metallurgy , programming language , polymer
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 MoO 3 ‐modified graphene IML, a high open circuit voltage (V oc ) 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 V oc of 0.58 V and J sc of 7.6 mA cm ‐2 in single PV cell. The value of V oc (J sc ) in the tandem cell is very close to the sum of V oc (J sc ) 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.