摘要
Semiconductor nanowires(NWs)have been extensively applied in light sources,waveguides,photodetectors(PDs),etc.,which provide abundant components for optoelectronic interconnection applications.However,the efficient in-plane integration of various devices remains challenging,which is a prerequisite for the practical application of NWs.Here,the growth-based integration of CsPbBr_(3)NW arrays with CdSSe ribbons transferred onto mica is achieved via a vapor deposition route.The transferred ribbons not only act as preferential nucleation sites for CsPbBr_(3),but also break the growth symmetry of CsPbBr_(3)NWs on mica,allowing wires with the largest angle to the ribbon edge to grow longer and form arrays.The waveguide studies show that the CsPbBr_(3)NW arrays can confine and guide the light emission from both themselves and the CdSSe ribbon well.Importantly,the optoelectronic interconnection was successfully demonstrated based on the achieved heterostructures,where the CsPbBr_(3)NWs served as the light source and waveguide,and PDs were made from the CdSSe ribbon.When a single CsPbBr_(3)NW was illuminated by a focused 457 nm laser at a distance of 37.5µm from the CdSSe ribbon,the on/off ratio of the system reached 8.3×10^(3),resulting from the efficient response of the PD to the guided light.Moreover,the system can distinguish the pulsed light excitation well below 2000 Hz,limited by the response speed of the PDs.This work paves the way for the on-chip integration of nanoscale light emitters,waveguides,and detectors,promoting the practical application of semiconductor NWs in photonic circuits.
半导体纳米线已被广泛应用于光源、波导、光电探测器等领域,为光电互连应用提供了丰富的功能元件.然而,如何将各种器件有效地面内集成仍然是一个挑战,而这是纳米线实际应用的前提.本研究通过气相沉积实现了CsPbBr_(3)纳米线阵列与转移在云母上的CdSSe纳米带的面内生长集成.转移的纳米带不仅作为CsPbBr_(3)的优先成核位点,而且打破了云母上CsPbBr_(3)纳米线的生长对称性,使得与纳米带边缘夹角最大的纳米线长得更长,从而形成阵列.波导研究表明,CsPbBr_(3)纳米线阵列可以很好地限制和波导来自自身和CdSSe带的发射光.重要的是,基于所获得的异质结构,CsPbBr_(3)纳米线作为光源和波导,由CdSSe带制成的光电探测器(PD)成功地实现了光电互连.当单根CsPbBr_(3)纳米线被聚焦到距离CdSSe带37.5μm的457 nm激光照射时,由于PD对波导光的有效响应,系统的开/关比可以达到8.3×10^(3).此外,受PD响应速度的限制,该系统可以很好地识别调制频率低于2000 Hz的脉冲光激励.该工作为纳米级光发射器、波导和探测器的片上集成提供了新的途径,促进了半导体纳米线在光子集成电路中的实际应用.
基金
the National Natural Science Foundation of China(62374057)。
