All-inorganic perovskite single crystal with tunable band gap and its growth method

[0038] CsPbCl 3 Crystal growth method, the steps are as follows:

[0039] (1) Take 8.4180g CsCl and 13.9055g PbCl 2 Place in a mortar, mix well and grind thoroughly, transfer to a quartz tube and evacuate to 10 -4 Pa and sealed, the sealed raw materials were placed in a single-temperature zone well-type furnace for high-temperature sintering. The sintering process was as follows: the temperature was raised to 630 °C for 6 h, kept for 24 h, and cooled to room temperature for 12 h to obtain a pure phase perovskite. Ore crystal polycrystalline material;

[0040] (2) Take the pure-phase perovskite crystal polycrystalline material and put it into a crystal growth quartz crucible, and evacuate to 10-4 Pa and sealed, put into the growth chamber of the double temperature zone Bridgman furnace,

[0041] (3) Turn on the heating device to heat the high-temperature zone and low-temperature zone of the growth chamber of the dual-temperature zone Bridgman furnace. The crystal growth q...

[0049] CsPbCl 2.5 Br 0.5 The growth method, carries out by the method for embodiment 1, and difference is:

[0050] Step (1) Take 3.1922g CsBr, 8.3433g PbCl 2 And 2.5254g CsCl is as polycrystalline material synthetic raw material, and polycrystalline material synthetic temperature is 620 ℃,

[0051] Step (3) superheat temperature is 620 °C.

[0052] The resulting CsPbCl 2.5 Br 0.5 Crystal appearance photo as image 3 shown.

[0053] The structure of the Bridgman furnace with two temperature zones is the same as in Example 1.

[0055] CsPbCl 1.5 Br 1.5 The growth method of crystal is carried out by the method for embodiment 1, difference is:

[0056] Step (1) Take 4.2562g CsBr, 4.1717g PbCl 2 and 1.8351 g PbBr 2 As a raw material for polycrystalline material synthesis, the polycrystalline material synthesis temperature is 610 °C,

[0057] The superheat temperature in step (3) is 610 °C.

[0058] The resulting CsPbCl 1.5 Br 1.5 Crystal appearance photo as Figure 4 shown.

[0059] The structure of the Bridgman furnace with two temperature zones is the same as in Example 1.