Abstract: A photo-detecting device includes a first semiconductor layer with a first dopant, a light-absorbing layer, a second semiconductor layer, and a semiconductor contact layer. The second semiconductor layer is located on the first semiconductor layer and has a first region and a second region, the light absorbing layer is located between the first semiconductor layer and the second semiconductor layer and has a third region and a fourth region, the semiconductor contact layer contacts the first region. The first region includes a second dopant and a third dopant, the second region includes second dopant, and the third region includes third dopant. The semiconductor contact layer has a first thickness greater than 50 ? and smaller than 1000 ?.

Abstract: A computerized data management method and a computerized data management system using the same are provided. The computerized data management method is used for encrypting/decrypting a digital data of an electronic device. The computerized data management method comprises the following steps. Firstly, a user's facial characteristic is captured. Next, whether the user's facial characteristic matches with an encrypting-permission user's facial characteristic stored in a database is determined in an encrypting process. If the user's facial characteristic matches with the encrypting-permission user's facial characteristic stored in the database, then the user is allowed to encrypt a digital data. Then, whether the user's facial characteristic matches with a facial characteristic of a decrypting-permission user corresponding a digital data is determined in a decrypting process.

Abstract: An operating system login method and an electronic device using the same are provided. The operating system login method comprises the following steps. Firstly, a facial characteristic of a user is captured. Next, whether the facial characteristic of the user is stored in a database is determined. If the facial characteristic is stored in the database, then a login user's account number and password are automatically read from the database. Then, whether the login user's account number and password pass verification is determined. If the user's account number and password pass verification, then the user is allowed to login the operating system.