Author Affiliations
Abstract
1 CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
4 School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Two-dimensional (2D) perovskites are hybrid layered materials in which the inorganic lattice of an octahedron is sandwiched by organic layers. They behave as a quantum-well structure exhibiting large exciton binding energy and high emission efficiency, which is excellent for photonic applications. Hence, the cavity modulation and cavity devices of 2D perovskites are widely investigated. In this review, we summarize the rich photophysics, synthetic methods of different cavity structures, and the cavity-based applications of 2D perovskites. We highlight the strong exciton–photon coupling and photonic lasing obtained in different cavity structures. In addition, functional optoelectronic devices using cavity structures of 2D perovskites are also reviewed.
Photonics Research
2020, 8(11): 11000A72
1 山东师范大学物理与电子科学学院, 山东 济南 250358
2 国家纳米科学中心, 中国科学院纳米科学卓越创新中心, 中国科学院纳米标准与检测重点实验室, 北京 100190
3 北京大学工学院材料科学与工程系, 北京 100871
4 北京大学宽禁带半导体研究中心, 北京 100871
5 中国科学院大学, 北京 100049
二维过渡金属硫族化合物(TMDC)具有独特的优势,可以作为增益材料实现激光发射。TMDC材料固有的强库仑相互作用和弱的介电屏蔽效应使其具有大的激子结合能,从而有助于实现室温下稳定的激子发光,其高达6~7的折射率能够提高光约束能力,原子层表面没有悬空键,当与硅基半导体器件连接时,能够避免晶格失配。这些独特性质使其成为极具潜力的增益材料,可以与硅基微腔连接构成激光器件,原子级厚度和近红外的光谱辐射能使其与集成器件互联。本文从光学微腔的分类和激光原理,以及二维材料激光器等方面总结了近几年基于TMDC材料的激光器研究进展,并指出了当前存在的问题及展望了其发展前景。
激光器 半导体激光器 过渡金属硫族化合物(TMDC) 光学微腔 光与物质相互作用
上海大学物理系索朗光伏材料与器件联合实验室, 上海 200444
提供了一种硅纳米墙结构器件的背面电极接触改善方法。通过利用超声的方法修饰金属催化法制备的硅纳米墙结构,并制备了AZO／硅纳米墙异质结光电器件。研究发现超声波可以对金属催化法制备的纳米硅墙进行单面修饰,与未经超声修饰的样品制备的器件相比,超声修饰能够改善硅纳米墙器件的背面电极欧姆接触,2 min的超声修饰可以将器件的串联电阻从587 Ω下降到082 Ω,填充因子提高86％,光电转换效率提高762％,提高了光电器件的载流子收集效率。
超声修饰 金属催化法 硅纳米墙 欧姆接触 ultrasonic modify metal assisted etching silicon nano-wall ohmic contact
上海大学物理系索朗光伏材料与器件联合实验室, 上海 200444
为减少光反射损失,通过热蒸发在织构单晶硅(经含有碱液和添加剂的特殊溶液80°C腐蚀30 min而成)表面上沉积了一定厚度的银膜后经一定温度(0～500°C)退火形成银纳米颗粒。SEM下观察到,银纳米颗粒的大小和形状与退火温度有很大关系。银纳米颗粒表现出的等离激元性质对反射谱有影响。实验分析得到, Ag沉积质量是0.003 8 g,400°C N2退火20 min时样品的反射率和反射率降低(REF<1)的波段达到最佳匹配。另外,金字塔上银纳米颗粒的均匀性与沉积的厚度有关。
热蒸发 织构单晶硅 银纳米颗粒 等离激元 反射增强因子 thermodynamic processing textured c-Si Ag nanoparticles plasmons reflectance enhancement factor
Author Affiliations
Abstract
InGaAs/GaAs vertical-cavity surface-emitting lasers (VCSELs) are fabricated by a thermal selective wet-oxidation confinement technique. Post-oxidation annealing in a nitrogen environment at high temperatures is then conducted to improve the performance of the oxide-confined InGaAs/GaAs VCSELs. The optimum post-oxidation annealing conditions are determined by changing the furnace temperature and annealing time. Compared with a unannealed laser device, the light output power increases by about 12%. An aging test is carried out to examine the reliability of the annealed oxide-confined VCSEL device. The temperature dependence of the lasing wavelength of the annealed oxide-confined VCSELs is also investigated.
250.5960 Semiconductor lasers 250.7260 Vertical cavity surface emitting lasers 140.7260 Vertical cavity surface emitting lasers Chinese Optics Letters
2012, 10(12): 122501
1 上海大学 索朗光伏材料与器件研发联合实验室, 上海 200444
2 上海电力学院 数理学院 物理实验中心, 上海 200090
利用光致发光(PL)分析快速热退火对Cu(In,Ga)Se2 (CIGS)电池的影响，研究退火对薄膜缺陷的影响。Cu(In,Ga)Se2电池的PL谱中总共有 7个峰，即2个可见波段峰和5个红外波段峰。退火温度较低，可减少薄膜体内缺陷，提高载流子浓度，改善薄膜质量；退火温度过高，则会引起正常格点处元素扩散，元素化学计量比改变，体内缺陷增加，吸收层带隙降低，反而会对CIGS薄膜造成破坏。
太阳能电池 快速热退火 光致发光 薄膜缺陷 solar cells rapid thermal annealing photoluminescence film defect
