Han Kun, Hu Kaige, Li Xiao, Huang Ke, Huang Zhen, Zeng Shengwei, Qi Dongchen, Ye Chen, Yang Jian, Xu Huan, Ariando Ariando, Yi Jiabao, Lü Weiming, Yan Shishen, Wang X Renshaw
School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore.
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Sci Adv. 2019 Aug 16;5(8):eaaw7286. doi: 10.1126/sciadv.aaw7286. eCollection 2019 Aug.
While benefiting greatly from electronics, our society also faces a major problem of electronic waste, which has already caused environmental pollution and adverse human health effects. Therefore, recyclability becomes a must-have feature in future electronics. Here, we demonstrate an erasable and recreatable two-dimensional electron gas (2DEG), which can be easily created and patterned by depositing a water-dissolvable overlayer of amorphous SrAlO (-SAO) on SrTiO (STO) at room temperature. The 2DEG can be repeatedly erased or recreated by depositing the -SAO or dissolving in water, respectively. Photoluminescence results show that the 2DEG arises from the -SAO-induced oxygen vacancy. Furthermore, by gradually depleting the 2DEG, a transition of nonlinear to linear Hall effect is observed, demonstrating an unexpected interfacial band structure. The convenience and repeatability in the creation of the water-dissolvable 2DEG with rich physics could potentially contribute to the exploration of next generation electronics, such as environment-friendly or water-soluble electronics.
尽管我们的社会从电子产品中受益匪浅，但也面临着电子垃圾这一重大问题，电子垃圾已经造成了环境污染并对人类健康产生了不利影响。因此，可回收性成为未来电子产品必备的特性。在此，我们展示了一种可擦除且可重新创建的二维电子气（2DEG），通过在室温下在SrTiO（STO）上沉积非晶态SrAlO（-SAO）的水溶性覆盖层，可以轻松地创建并对其进行图案化。通过分别沉积-SAO或在水中溶解，2DEG可以被反复擦除或重新创建。光致发光结果表明，2DEG源自-SAO诱导的氧空位。此外，通过逐渐耗尽2DEG，观察到了非线性霍尔效应到线性霍尔效应的转变，这证明了一种意想不到的界面能带结构。创建具有丰富物理特性的水溶性2DEG的便利性和可重复性可能有助于探索下一代电子产品，如环保型或水溶性电子产品。
