Li-doped Cu₂O/ZnO heterojunction for flexible and semi-transparent piezoelectric nanogenerators

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• 作者：Kyung-Su Cho^a ; Doo-Hee Kim^a ; Young-Hwan Kim^b ; Junghyo Nah^b ; Han-Ki Kim^a ; ^{imdlhkkim@khu.ac.kr}
• 关键词：Li-doped Cu2O ; p-n heterojunction ; Flexible and semi-transparent piezoelectric nanogenerators ; ZnO ; Output power
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：2279-2287
• 全文大小：1800 K
• 卷排序：43

文摘

We have investigated the characteristics of p-type Li-doped Cu2O (LCO) films grown by radio frequency magnetron sputtering to use as p-n heterojunction for flexible and semi-transparent piezoelectric nanogenerators (PENGs). Electrical, optical, morphological properties of the LCO films were examined as a function of Ar/O2 flow ratio as well as work function. The LCO films grown at Ar/O2 ratio of 20/4 sccm film showed a p-type behavior with resistivity of 2.12 Ω-cm, mobility of 0.364 cm2/V-s, and carrier concentration of 8.07×1019 cm-3. To overcome the piezoelectric potential screening effect of conventional ZnO-based PENGs, the p-type LCO layer was employed. Due to the enhanced piezoelectric potential coupled with the reduced total capacitance, the PENG with a p-LCO/n-ZnO heterojunction demonstrates the much higher output power up to ~52 μW than PENG only with ZnO layer (7 μW). The improved output power of PENGs indicates that sputtering of the p-type LCO layer on the n-type ZnO is the effective method to overcome the limit of the ZnO-based PENGs.