并行共焦测量中的并行光源技术综述

并行共焦测量技术的核心是将单点共焦测量变成多点同时扫描测量,从而使共焦测量速度显著提高。本文介绍了共焦测量技术原理,综述了用于并行共焦的并行光源技术,分析了这些方法的优点和不足。结合作者近年来的研究成果,重点阐述了基于微透镜阵列和数字微镜器件(DMD)产生并行光源的新方法。分析和研究了DMD的空间光调制机理,最终建立了一种单光源双光路并行像散共焦测量系统。     

Sputtered SnO2 as an interlayer for efficient semitransparent perovskite solar cells

SnO₂ is widely used as the electron transport layer (ETL) in perovskite solar cells (PSCs) due to its excellent electron mobility, low processing temperature, and low cost. And the most common way of preparing the SnO₂ ETL is spin-coating using the corresponding colloid solution. However, the spin-coated SnO₂ layer is sometimes not so compact and contains pinholes, weakening the hole blocking capability. Here, a SnO₂ thin film prepared through magnetron-sputtering was inserted between ITO and the spin-coated SnO₂ acted as an interlayer. This strategy can combine the advantages of efficient electron extraction and hole blocking due to the high compactness of the sputtered film and the excellent electronic property of the spin-coated SnO₂. Therefore, the recombination of photo-generated carriers at the interface is significantly reduced. As a result, the semitransparent perovskite solar cells (with a bandgap of 1.73 eV) based on this double-layered SnO₂ demonstrate a maximum efficiency of 17.7% (stabilized at 17.04%) with negligible hysteresis. Moreover, the shelf stability of the device is also significantly improved, maintaining 95% of the initial efficiency after 800-hours of aging.