Han, Eunmi 사진
Han, Eunmi
Opto-electron Research Lab ()


Laboratory Introduction

A solar cell is an electronic device based on a photovoltaic effect in which voltage and current are generated when light having energy is irradiated to the surface of a material. A semiconductor having a band gap smaller than the light energy of a solar cell absorbs energy by receiving light from the solar cell, and can excite electrons in the valence band as conduction bands. At this time, the excited electrons can flow as a current by an external voltage. In order to create such an external voltage environment, a junction of a p-tyep semiconductor and an n-type semiconductor is made to form a junction. When a p-type semiconductor and an n-type semiconductor are joined, band bending occurs at the interface between materials due to different Fermi energy levels of the two semiconductors. An electric field is created between the semiconductors. Due to this band bending of pn-junction, electrons excited by the conduction band under the light of the sun can move from the p-type semiconductor to the n-type semiconductor, thereby generating a current. The generated current flows along the circuit and can be used as an energy source to charge the battery, turn on the light bulb, or turn the motor.also performed.

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Research Activities