Photodetectors: Ultrasensitive Room‐Temperature Terahertz Direct Detection Based on a Bismuth Selenide Topological Insulator (Adv. Funct. Mater. 31/2018)

Abstract

In article number https://doi.org/10.1002/adfm.201801786, Lin Wang, Xiaoshuang Chen, and their co‐workers propose a metal‐topological insulator–metal subwavelength structure for ultrasensitivity, room temperature terahertz photodetection. The integration of a topological insulator and micro structures exploits the unique properties of topological surface states and opens up a new route for fast imaging applications, promising a superb impact on THz optoelectronics.

Selenophene‐fused Perylene Diimide‐Based Cathode Interlayer Enables 19 % Efficiency Binary Organic Solar Cells via Stimulative Charge Extraction

“…The specific conductivity values were obtained according to the equation of I ¼ sAd À 1 V, where A is the active area of devices and d is the thickness of the CILs. [19] As shown in Figure 1d, SePDI3 presents a higher conductivity (1.59×10 À 5 s cm À 1 ) than PDI3 (1.25×10 À 5 s cm À 1 ), consistent with the EPR results. Ultimately, SePDI3 exhibits superior charge transport capacity, resulting in high J sc .…”

“…Therefore, the conductivities of both CIMs are evaluated employing a device model: ITO/CILs/Ag. The specific conductivity values were obtained according to the equation of $${I=\sigma A{d}^{-1}V}$$ , where A is the active area of devices and d is the thickness of the CILs [19] . As shown in Figure 1d, SePDI3 presents a higher conductivity (1.59×10 −5 s cm −1 ) than PDI3 (1.25×10 −5 s cm −1 ), consistent with the EPR results.…”

Dithienoquinoxalineimide‐Based Polymer Donor Enables All‐Polymer Solar Cells Over 19 % Efficiency

“…Notably, the J sc and FF of the QQ1 : PY-IT are significantly higher than those of the PM6 : PY-IT-based devices. [29] The V oc is significantly higher than those of nonhalogenated polymer donors reported in all-PSCs, which typically obtained V oc below 0.9 V (Table S3). The results highlighted the remarkable ability of DTQI electron-withdrawing building block to achieve deep HOMO level, thus higher V oc and PCE.…”

“…To gain further insights into the superior photovoltaic performance of QQ1 : PY‐IT, a comparative study was carried out with halogenated polymer donor PM6. Notably, the J sc and FF of the QQ1 : PY‐IT are significantly higher than those of the PM6 : PY‐IT‐based devices [29] . The V oc is significantly higher than those of nonhalogenated polymer donors reported in all‐PSCs, which typically obtained V oc below 0.9 V (Table S3).…”

Stress release via thermodynamic regulation towards efficient flexible perovskite solar cells

“…In TPC measurements, the attenuation of transient photocurrent can reflect the quenching speed of photoelectrons in different perovskite films. 60 As shown in Fig. 4g, the charge decay time of the reference and camphorbased f-PSCs was 276.5 and 216.3 ns, respectively, indicating that the camphor-based perovskite films modified by camphor had less electron-hole recombination and longer distance for charge transport.…”