Organic Zener Diodes: Tunneling across the Gap in Organic Semiconductor Materials
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- 作者：Hans Kleemann ; Rafael Gutierrez ; Frank Lindner ; Stanislav Avdoshenko ; Pedro D. Manrique ; Bjrn Lssem ; Gianaurelio Cuniberti ; Karl Leo
- 刊名：Nano Letters
- 出版年：2010
- 出版时间：December 8, 2010
- 年：2010
- 卷：10
- 期：12
- 页码：4929-4934
- 全文大小：384K
- 年卷期：v.10,no.12(December 8, 2010)
- ISSN：1530-6992
文摘
Organic Zener diodes with a precisely adjustable reverse breakdown from −3 to −15 V without any influence on the forward current−voltage curve are realized. This is accomplished by controlling the width of the charge depletion zone in a pin-diode with an accuracy of one nanometer independently of the doping concentration and the thickness of the intrinsic layer. The breakdown effect with its exponential current voltage behavior and a weak temperature dependence is explained by a tunneling mechanism across the highest occupied molecular orbital−lowest unoccupied molecular orbital gap of neighboring molecules. The experimental data are confirmed by a minimal Hamiltonian model approach, including coherent tunneling and incoherent hopping processes as possible charge transport pathways through the effective device region.