Shin, Jaeho Yang, Seunghoon Eo, Jung Sun Jeon, Takgyeong Lee, Jaeho Lee, Chul-Ho Wang, Gunuk 2024-01-19T11:02:39Z 2024-01-19T11:02:39Z 2022-09-15 2022-10 2366-9608 https://pubs.kist.re.kr/handle/201004/114511 Solid-state devices capable of controlling light-responsive charge transport at the molecular scale are essential for developing molecular optoelectronic technology. Here, a solid-state molecular photodiode device constructed by forming van der Waals (vdW) heterojunctions between standard molecular self-assembled monolayers and two-dimensional semiconductors such as WSe2 is reported. In particular, two non-functionalized molecular species used herein (i.e., tridecafluoro-1-octanethiol and 1-octanethiol) enable bidirectional modulation of the interface band alignment with WSe2, depending on their dipole orientations. This dipole-induced band modulation at the vdW heterointerface leads to the opposite change of both photoswitching polarity and rectifying characteristics. Furthermore, compared with other molecular or 2D photodiodes at a similar scale, these heterojunction devices exhibit significantly enhanced photo-responsive performances in terms of photocurrent magnitude, open-circuit potential, and switching speed. This study proposes a novel concept of the solid-state molecular optoelectronic device with controlled functions and enhanced performances. English WILEY-V C H VERLAG GMBH Molecular Van Der Waals Heterojunction Photodiodes Enabling Dipole-Induced Polarity Switching Article 10.1002/smtd.202200646 1 Small Methods, v.6, no.10 Small Methods 6 10 N scie scopus 000849043100001 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article WORK-FUNCTIONS JUNCTIONS TRANSPORT GRAPHENE LAYER MOS2 PHOTOLUMINESCENCE PHOTOEMISSION PHOTOCURRENT RESPONSIVITY molecular self-assembled monolayers solid-state devices van der Waals heterojunctions