npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2015; 65: 602-607

Published online June 30, 2015

Copyright © New Physics: Sae Mulli.

Characteristics of Photocurrents in the Photoelectric Effect

광전효과에서 광전류 특성

Hye Jin HA1, Sang Ho SOHN*1, Jung Soo KIM2

1 Department of Science Education, Graduate School, Kyungpook National University, Daegu 700-702, Korea
2 Daegu Technical High School, Daegu 701-820, Korea


Received: April 3, 2015; Revised: May 20, 2015; Accepted: May 22, 2105

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


The relationship between the applied voltages (V) and the photocurrents ($I$) was evaluated theoretically, and the result was compared with the experimental values. The apparatus for measuring the potoelectric effect was composed of a mercury light source and a photoelectric tube with a BaO photo-detector. The measurements of the photocurrents were performed by changing the frequency and the intensity of the incident light. The photocurrent at a voltage of 0 V was found theoretically to depend on the frequency of the incident light, which agreed with the experimental result. In addition, the theoretical photocurrent exhibited on approximately $\sqrt{V}$ dependence, which was different from the experimental result.

Keywords: Photoelectric effect, Photocurrent, Frequency

광전효과의 광전류 (I)와 광전관의 두 전극에 걸린 전압 (V)의 관계를 이론적으로 구하고 실험값과 비교하였다. 실험은 수은 광원과 BaO 음극 물질을 가진 광전관으로 수행하였으며, 빛의 진동수 ($\nu$)와 세기를 바꾸어 가며 광전류를 측정하였다. 공간전하 효과를 무시하고 광전류의 특성을 이론적으로 표현을 할 때 전압이 0일 때의 광전류 $I_{0}$는 진동수 ($\nu$)에 의존하는 것으로 나타나며, 이는 실험적 결과와 유사함을 보였다. 또한 광전류는 근사적으로 $\sqrt{V}$에 의존하는 것으로 나타났으며 도출된 이론식에 의한 그래프와 실험에 의한 그래프는 차이를 보였다. 역전압의 경우, 광전류의 이론값이 실험값보다 크게 나타났으며 정전압인 경우는 이와 반대로 나타났다.

Keywords: 광전효과, 광전류, 진동수

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