소스 전극의 일함수 변화가 N형 유기 박막트랜지스터의 전기적 특성에 미치는 영향
Effect of work function variation of the source electrode on electrical properties of N-type organic thin-film transistors
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소스 전극의 일함수 변화가 N형 유기 박막 트랜지스터의 전기적 특성에 미치는 영향을 제시하였다. 금, 이중층, 알루미늄을 사용하여 각각 4.55 eV, 4.44 eV, 3.63 eV의 일함수를 가지는 소스 전극을 제작하였다. 전극의 일함수가 낮아질수록 턴-온 전압은 감소하는 경향을 보이지만 온-전류는 이중층 전극이 가장 높게 나타나고 알루미늄 전극이 가장 작은 값을 나타냈다. 이러한 결과는소스 전극과 유기물 반도체 사이의 전하 주입 장벽 크기의 차이와 금속 전극의 산화막 형성으로 인한 것으로 보인다. 전하 주입 장벽의 크기를 줄이면서 소스 전극의 산화도 심하지 않은 이중층 소스 전극을 사용한 경우에 최적화된 소자 특성을 얻을 수 있었다.
Abstract
This study investigates the influence of source electrode work function variation on the electrical properties ofN-type organic thin-film transistors (OTFTs). Source electrodes with work functions of 4.55 eV, 4.44 eV, and 3.63eV were fabricated using gold, a bilayer configuration, and aluminum, respectively. The findings reveal that as thework function of the electrode decreases, the turn-on voltage decreases. The bilayer electrode exhibited thehighest on-current, while the aluminum electrode showed the lowest. This variation is attributed to differences inthe charge injection barrier between the source electrode and the organic semiconductor, as well as the formationof an oxide layer on the metal electrode. These results provide a basic understanding for modulating the electricalcharacteristics of N-type OTFTs.
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