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Efficient organic solar cells(OSCs)based on regioregular poly(3-hexylthiophene):fullerene derivative [6,6]-phenyl-C61butyric acid methyl ester composites have been fabricated on fluorine-doped tin oxidecoated glass substrates by a radio frequency sputtered and ultraviolet ozone(UVO)treated MoS2 film as the hole-transport layer(HTL)(showed in Fig 1a).It is found that the deposition temperature can modulate the contents of the various valence states of molybdenum,which can result in changes of the energy level,and the optical and electrical properties of the MoS2 films.