Adjustable Positive-Negative Signal in Self-Driven Photodetector based on Cubic CH3NH3PbI3 Large Single Crystal

<p><b>In this study, for the first time, self-driven photodetector based on cubic CH₃NH₃PbI₃ large single crystal </b><b>(C-MAPbI₃LSC) </b><b>with adjustable positive-negative signal is fabricated. </b><b>The preparation of MAPbI₃large single crystal (MAPbI₃LSC) is realized by the method of growth-drop-growth (GDG). </b><b>The band gap of </b><b>MAPbI₃</b><b>single crystals </b><b>with Pm-3m (221) space group (6.134×6.134×6.134 Å, 90.00 x 90.00 x 90.00) </b><b>is 1.58 eV.</b> <b>CH₃NH₃⁺ cation is orientation-disorder </b><b>within the perovskite cubo-octahedral cavity.</b><b> The photocurrent density at 803 nm of the</b><b> C-MAPbI₃LSC</b><b> photodetector under different bias voltages is the highest under different wavelength. The </b><b>responsivities (R), response time, external quantum efficiencies (EQE) and the detectivity (D) for </b><b>C-MAPbI₃LSC</b><b> photodetector at 803 nm wavelength with 1 W m^-2</b><b>, respectively, is </b><b>508.7 µA/mW, 0.1338 ms, 79.6% and 8.64*10¹¹ Jones. Notably, </b><b>the C-MAPbI₃LSC photodetector can be self-driven under 0 V bias voltage, in particular, the positive and negative values of the photocurrent can be adjusted. The proposed mechanism of poling inducing built-in potential is explained adjustable positive-negative signal in self-driven photodetector based on cubic CH₃NH₃PbI₃ large single crystal.</b><b></b></p>

Adjustable Positive-Negative Signal in Self-Driven Photodetector based on Cubic CH3NH3PbI3 Large Single Crystal

<p><b>In this study, for the first time, self-driven photodetector based on cubic CH₃NH₃PbI₃ large single crystal </b><b>(C-MAPbI₃LSC) </b><b>with adjustable positive-negative signal is fabricated. </b><b>The preparation of MAPbI₃large single crystal (MAPbI₃LSC) is realized by the method of growth-drop-growth (GDG). </b><b>The band gap of </b><b>MAPbI₃</b><b>single crystals </b><b>with Pm-3m (221) space group (6.134×6.134×6.134 Å, 90.00 x 90.00 x 90.00) </b><b>is 1.58 eV.</b> <b>CH₃NH₃⁺ cation is orientation-disorder </b><b>within the perovskite cubo-octahedral cavity.</b><b> The photocurrent density at 803 nm of the</b><b> C-MAPbI₃LSC</b><b> photodetector under different bias voltages is the highest under different wavelength. The </b><b>responsivities (R), response time, external quantum efficiencies (EQE) and the detectivity (D) for </b><b>C-MAPbI₃LSC</b><b> photodetector at 803 nm wavelength with 1 W m^-2</b><b>, respectively, is </b><b>508.7 µA/mW, 0.1338 ms, 79.6% and 8.64*10¹¹ Jones. Notably, </b><b>the C-MAPbI₃LSC photodetector can be self-driven under 0 V bias voltage, in particular, the positive and negative values of the photocurrent can be adjusted. The proposed mechanism of poling inducing built-in potential is explained adjustable positive-negative signal in self-driven photodetector based on cubic CH₃NH₃PbI₃ large single crystal.</b><b></b></p>

First three-dimensional actinide polyrotaxane framework mediated by windmill-like six-connected oligomeric uranyl: dual roles of the pseudorotaxane precursor

The first 3D uranyl polyrotaxane framework with a pseudorotaxane guest trapped in an octahedral cavity was synthesized based on tetra-nuclear uranyl.