Nuclear radiation detector based on two-dimensional perovskite single crystal and preparation method thereof

A nuclear radiation detector and perovskite technology, applied in the field of nuclear radiation detectors, can solve the problems of low carrier mobility and lifetime, low detection sensitivity, and many defects in perovskite, so as to improve the lifetime and mobility. , the effect of increasing exciton diffusion length and reducing traps and defects

Pending Publication Date: 2020-11-13
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has low carrier mobility and lifetime, many perovskite defects, and large dark current, resulting in low detection sensitivity.

Method used

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  • Nuclear radiation detector based on two-dimensional perovskite single crystal and preparation method thereof
  • Nuclear radiation detector based on two-dimensional perovskite single crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the electrode before preparation adopts gold, and the two-dimensional perovskite absorption layer adopts (C 3 h 7 NH 3 ) 2 PbBr 4 , nuclear radiation detector with gold back electrode

[0032] Step 1, preparation (C 3 h 7 NH 3 ) 2 PbBr 4 solution and chlorobenzene anti-solvent solution.

[0033] 1.1) 36.7 grams of lead bromide PbBr 2 and 28 grams of propylammonium bromide C 3 h 7 NH 3 Br was added to 100 ml of dimethylformamide solvent and stirred at room temperature for 24 hours to obtain (C 3 h 7 NH 3 ) 2 PbBr 4 solution;

[0034] 1.2) Add 100 milliliters of chlorobenzene solvent into a jar to obtain a chlorobenzene anti-solvent solution.

[0035] Step 2, grow (C 3 h 7 NH 3 ) 2 PbBr 4 single crystal.

[0036] will be loaded with (C 3 h 7 NH 3 ) 2 PbBr 4 The sample bottle of solution is placed in the jar that chlorobenzene solution is housed, then jar is placed in the oven of constant temperature 25 degrees centigrade and sta...

Embodiment 2

[0043] Example 2: Silver is used for the electrode before preparation, and (PEA) is used for the two-dimensional perovskite absorber layer 2 PB 4 , the back electrode adopts silver nuclear radiation detector.

[0044] Step 1, 49.8 grams of phenethylamine iodide PEAI and 46.1 grams of lead iodide were dissolved in 100 milliliters of butyrolactone solvent, stirred at room temperature for 24 hours to obtain (PEA) 2 PB 4 solution.

[0045] Step 2, the prepared (PEA) 2 PB 4 The solution is placed in an oven, and the initial temperature of the oven is set to 80 degrees Celsius, and then the temperature is cooled to 30 degrees Celsius at a rate of 1 degrees Celsius / hour to grow (PEA) 2 PB 4 single crystal.

[0046] Step 3, preparing the front electrode.

[0047] First, the (PEA) 2 PB 4 The upper surface of the single crystal is placed downwards in the mask plate of the chamber of the vacuum coating instrument, and silver with a purity of more than 99.9% is placed in the eva...

Embodiment 3

[0050] Embodiment 3: the electrode before preparation adopts nickel, and the two-dimensional perovskite layer adopts (C 4 h 9 NH 3 ) 2 (CH 3 NH 3 )Pb 2 I 7 , nuclear radiation detector with nickel back electrode

[0051] Step A, C 4 h 9 NH 3 ) 2 (CH 3 NH 3 )Pb 2 I 7 solution.

[0052] 40.2 g of butyl ammonium iodide C 4 h 9 NH 3 I, the methyl ammonium iodide CH of 15.9 grams 3 NH 3 PbI and 92.2 grams of lead iodide were dissolved in 100 milliliters of dimethylformamide solvent, stirred at room temperature for 20 hours to obtain (C 4 h 9 NH 3 ) 2 (CH 3 NH 3 )Pb 2 I 7 solution.

[0053] Step B, grow (C 4 h 9 NH 3 ) 2 (CH 3 NH 3 )Pb 2 I 7 single crystal.

[0054] The prepared (C 4 h 9 NH 3 ) 2 (CH 3 NH 3 )Pb 2 I 7 The solution is placed in an oven, and the initial temperature of the oven is set to 30 degrees Celsius, and then the temperature is raised to 90 degrees Celsius at a rate of 2 degrees Celsius / day, and the (C 4 h 9 NH 3 ) ...

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Abstract

The invention discloses a nuclear radiation detector based on a two-dimensional perovskite single crystal and a preparation method, which mainly solve the problems of low carrier mobility, large darkcurrent and poor charge transmission performance in the prior art. The detector sequentially comprises a front electrode (1), a perovskite absorption layer (2) and a back electrode (3) from bottom totop. The perovskite absorption layer adopts a two-dimensional perovskite single crystal A2Bn-1CnX3n+1 with the thickness of 1 to 10mm, and the thickness of the two-dimensional perovskite single crystal A2Bn-1CnX3n+1 is 1 to 10mm. A is one or more of benzylamine, phenylethylamine, C4H9NH3, C4H12N2, C3H7NH3 or C8H12N, B is one or more of CH3NH3, CH(NH2)2, Cs or Rb, C is one or more of Pb, Sn or Ge,X is Cl, Br or I, and n ranges from 1 to 3. Dark current is reduced, the carrier mobility is improved, the service life is prolonged, the sensitivity of a nuclear radiation detector is improved, and the method can be used for environmental monitoring in the field of nuclear industry.

Description

technical field [0001] The invention belongs to the technical field of semiconductor devices, in particular to a nuclear radiation detector, which can be used for environmental monitoring in the nuclear industry. Background technique [0002] Nuclear radiation detectors are mainly divided into three types: gas detectors, scintillator detectors, and semiconductor detectors. The principle of the gas detector is that gas molecules ionized by high-energy ray particles generate a pulse current under high voltage. The disadvantage is that it can only detect the number of high-energy ray particles, but cannot distinguish the energy of high-energy ray particles. The scintillator detector converts high-energy ray particles into visible light, and then converts visible light into electrical signals through photodiodes. Its disadvantages are long luminescence decay time and low photon generation rate. [0003] In order to solve the above shortcomings, semiconductor detectors have emer...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/00H10K71/60H10K85/30H10K30/10Y02E10/549
Inventor 常晶晶林珍华赵鹏苏杰欧阳晓平郝跃
Owner XIDIAN UNIV
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