Extrinsic photoconduction

...This is called intrinsic photoconduction. There is also extrinsic photoconduction, in which even light with energy smaller than the band gap can excite electrons or holes from these levels due to the presence of impurities or lattice defects, increasing electrical conductivity. The current that flows through a sample when no light is applied is called dark current, and the current that increases due to light irradiation is called photocurrent. ...

*Some of the terminology explanations that refer to "extrinsic photoconduction" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…これを真性光伝導という。また不純物や格子欠陥が存在するために禁止帯幅より小さなエネルギーの光でも，これらの準位から電子または正孔が励起されて電気伝導度が増加する外因型光伝導もある。光を当てないときに試料に流れる電流を暗電流と呼び，光照射によって増加した電流を光電流という。…

※「外因型光伝導」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報