Fig. 2: Spontaneous photovoltaic effect in the MoSSe devices. | Nature Communications

Fig. 2: Spontaneous photovoltaic effect in the MoSSe devices.

From: Anomalous photovoltaics in Janus MoSSe monolayers

Fig. 2

a Schematic of the photovoltaic device. The heterostructure consists of a MoSSe film sandwiched between two graphene electrodes, which is further encapsulated by BN films. b Optical image of the MoSSe bilayer device. The effective area (overlap area of the MoSSe bilayer, top and bottom graphene electrodes) is marked by the red solid line. The MoSSe bilayer and graphene electrodes are outlined by orange and gray dashed lines, respectively. c Short-circuit photocurrent mapping result of the MoSSe bilayer device, corresponding to the area marked by the red solid line in (b). d Short-circuit photocurrent of the MoSSe bilayer and MoS2 bilayer devices as a function of bias voltage under the same illumination conditions. The nonzero photocurrent at zero bias voltage indicates spontaneous photovoltaic responses in the MoSSe device. e Line scan photocurrent result of the MoSSe device indicated by the horizontal white dashed line in (b) and (c). The different photocurrent results in and out of the effective area with different configurations help to demonstrate the origin of the spontaneous photocurrent. f Layer dependence of the short-circuit current and open-circuit voltage in the MoSSe device. With increasing layer number, the photocurrent remains nearly unchanged, while the voltage increases accordingly.

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