The South China University of Technology

Grg Banking Equipment Co., Ltd.

Lei Wen

Guoqiang Li

Fangliang Gao

Jingling Li

Shuguang Zhang

Wenjun Liao

Yunfang Guan

Disclosed is a preparation method for a GaAs thin film grown on an Si substrate, said method comprising the following steps: (1) Si (111) substrate cleaning; (2) Si (111) substrate preprocessing; (3) Si (111) substrate oxide film removal; (4) first InGaAs buffer layer growth; (5) first InGaAs buffer layer in situ annealing; (6) GaAs buffer layer growth; (7) GaAs buffer layer in situ annealing; (8) second InGaAs buffer layer growth; (9) second InGaAs buffer layer in situ annealing; (10) GaAs epitaxial thin film growth. Also disclosed is a GaAs thin film grown on an Si substrate. The GaAs thin film obtained by the present invention has a good crystal quality, an even surface, and a positive promotional significance with regard to the preparation of semiconductor devices, particularly in the field of solar cells.

GaAs thin film grown on Si substrate, and preparation method for GaAs thin film grown on Si substrate

The present invention discloses an InGaAs film grown on a Si substrate, which comprises a Si substrate, a low temperature InGaAs buffer layer, a high temperature InGaAs buffer layer and an InGaAs epitaxial film, arranged sequentially, wherein the low temperature InGaAs buffer layer is an InGaAs buffer layer grown at the temperature of 350&#x2dc;380&#xb0; C.; the high temperature InGaAs buffer layer is an InGaAs buffer layer grown at the temperature of 500&#x2dc;540&#xb0; C., and the sum of the thickness of the low temperature InGaAs buffer layer and the thickness of the high temperature InGaAs buffer layer is 10&#x2dc;20 nm. The invention further discloses a method for preparing the InGaAs film. The InGaAs film grown on the Si substrate of the present invention has good crystal quality, is almost completely relaxed, and has a simple preparation process.

InGaAs film grown on Si substrate and method for preparing the same

A connector for a cash box comprises a male connector () disposed on the cash box () and a female connector () disposed on a cash box bracket (). An elastic element () is disposed on the cash box bracket () and provides the female connector () with a thrust for matching the male connector () tightly. The elastic element () is further connected with a floating board () and provides the floating board () with a supporting force along the assembly direction of the cash box (). A protecting cover device () is further disposed on the cash box bracket (), located over the female connector (), and comprises a protection cover bracket (), a resetting torsion spring (), and a cover body (). The cover body () is pivoted to the protection cover bracket () with a shaft (). The resetting torsion spring () is sleeved on the shaft (), located between the cover body () and the protection cover bracket (), and provides the cover body () with a torque force to cover the female connector () without any external force. The cover body () is opened by the side wall of the cash box to complete the connection when the cash box () is assembled.

Connector for cash box

Growing community of inventors

Guangzhou, China

Lei Wen