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In future solar cell technologies, the thermodynamic Shockley-Queisser limitfor solar-to-current conversion in traditional p-n junctions could potentiallybe overcome with a bulk photovoltaic effect by creating an inversion brokensymmetry in piezoelectric or ferroelectric materials. Here, we unveiledmechanical distortion-induced bulk photovoltaic behavior in a two-dimensionalmaterial (2D), MoTe2, caused by phase transition and broken inversion symmetryin MoTe2. The phase transition from single-crystalline semiconducting 2H-MoTe2to semi-metallic 1T-MoTe2 was confirmed using X-ray photoelectron spectroscopy(XPS). We used a micrometer-scale system to measure the absorption of energy,which reduced from 800 meV to 63 meV when phase transformation from hexagonalto distorted octahedral and revealed a smaller bandgap semi-metallic behavior.Experimentally, a large bulk photovoltaic response is anticipated with themaximum photovoltage VOC = 16 mV and a positive signal of the ISC = 60 uA (400nm, 90.4 Wcm-2) in the absence of an external electric field. The maximumvalues of both R and EQE were found to be 98 mAW-1 and 30 %, respectively. Ourfindings unveil distinctive features of the photocurrent responses caused byin-plane polarity and its potential from a wide pool of established TMD-basednanomaterials, and a novel approach to reach high efficiency in convertingphotons-to-electricity for power harvesting optoelectronics devices.

Bulk Photovoltaic Effect in Two-Dimensional Distorted MoTe2