Yu, Xiaoyun Rahmanudin, Aiman Jeanbourquin, Xavier A. Tsokkou, Demetra Guijarro, Néstor Banerji, Natalie Sivula, Kevin 2017-02-10 Exfoliated transition metal dichalcogenides (2D-TMDs) are attractive light-harvesting materials for large-area and inexpensive solar energy conversion given their ability to form highly tolerant heterojunctions. However, the preparation of large-area heterojunctions with these materials remains a challenge toward practical devices, and the details of photogenerated charge carrier harvesting are not well established. In this work, we use all solution-based methods to prepare large-area hybrid heterojunction films consisting of exfoliated semiconducting 2H-MoS2 flakes and a perylene-diimide (PDI) derivative. Hybrid photoelectrodes exhibited a 6-fold improvement in photocurrent compared to that of bare MoS2 or PDI films. Kelvin probe force microscopy, X-ray photoelectron spectroscopy, and transient absorption measurements of the hybrid films indicate the formation of an interfacial dipole at the MoS2/organic interface and suggest that the photogenerated holes transfer from MoS2 to the PDI. Moreover, performing the same analysis on MoSe2-based hybrid devices confirms the importance of proper valence band alignment for efficient charge transfer and photogenerated carrier collection in TMD/organic semiconductor hybrid heterojunctions. application/pdf https://folia.unifr.ch/global/documents/305448 https://folia.unifr.ch/documents/305448/files/ban_hhs.pdf https://folia.unifr.ch/documents/305448/files/ban_hhs_sm.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acsenergylett.6b00707 info:eu-repo/semantics/openAccess License undefined ACS Energy Letters. - 2017, vol. 2, no. 2, p. 524–531 info:eu-repo/classification/udc/54 Hybrid heterojunctions of solution-processed semiconducting 2d transition metal dichalcogenides http://purl.org/coar/resource_type/c_6501