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Influence of the highest occupied molecular orbital energy level of the donor material on the effectiveness of the anode buffer layer in organic solar cells
Author(s) -
Bernède J. C.,
Cattin L.,
Djobo S. Ouro,
Morsli M.,
Kanth S. R. B.,
Patil S.,
Leriche P.,
Roncali J.,
Godoy A.,
Diaz F. R.,
del Valle M. A.
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127047
Subject(s) - work function , anode , homo/lumo , acceptor , organic solar cell , oxide , layer (electronics) , chemistry , materials science , nanotechnology , chemical physics , electrode , molecule , organic chemistry , physics , polymer , condensed matter physics
Efficiency of organic photovoltaic cells based on organic electron donor/organic electron acceptor junctions can be strongly improved when the transparent conductive Anode is coated with a Buffer Layer (ABL). Here, the effects of a metal (gold) or oxide (molybdenum oxide) ABL are reported, as a function of the Highest Occupied Molecular Orbital (HOMO) of different electron donors. The results indicate that a good matching between the work function of the anode and the highest occupied molecular orbital of the donor material is the major factor limiting the hole transfer efficiency. Indeed, gold is efficient as ABL only when the HOMO of the organic donor is close to its work function Φ Au . Therefore we show that the MoO 3 oxide has a wider field of application as ABL than gold.