Materials and Designs for Wearable Photodetectors

Abstract

Photodetectors (PDs), as an indispensable component in electronics, are highly desired to be flexible to meet the trend of next‐generation wearable electronics. Unfortunately, no in‐depth reviews on the design strategies, material exploration, and potential applications of wearable photodetectors are found in literature to date. Thus, this progress report first summarizes the fundamental design principles of turning “hard” photodetectors “soft,” including 2D (polymer and paper substrate‐based devices) and 1D PDs (fiber shaped devices). In short, the flexibility of PDs is realized through elaborate substrate modification, material selection, and device layout. More importantly, this report presents the current progress and specific requirements for wearable PDs according to the application: monitoring, imaging, and optical communication. Challenges and future research directions in these fields are proposed at the end. The purpose of this progress report is not only to shed light on the basic design principles of wearable PDs, but also serve as the roadmap for future exploration in wearable PDs in various applications, including health monitoring and Internet of Things.

Selective Growth of Zn–Co–Se Nanostructures on Various Conductive Substrates for Asymmetric Flexible Hybrid Supercapacitor with Enhanced Performance

“…2020, 5,1900873 Zn-Co-Se to date and comparing favorably to literature findings of ASCs or solid-state supercapacitors (SSCs). In comparison with Zn-Mn-Se, the optimized Zn-Co-Se manifested an encouraging outlook in enhancing the performance of FAHSC.…”

“…The Zn-Co-Se architecture was uniformly distributed and had good contact with the NF. 2020, 5,1900873 The magnified SEM image ( Figure 2f) clearly illustrates that Zn-Mn-Se was well distributed and highly aligned with nanoshell structure and the corresponding elemental mapping images show homogeneous distribution of Zn, Mn, and Se elements in the Zn-Mn-Se (Figure 2h-iii). Furthermore, to support this result, Figure 2di-iii reveals the coexistence and homogeneous dispersion of Zn, Co, and Se in Adv.…”

“…Besides, the electrolyte, which means salt and solvent, plays an important role in SCs, providing ionic conductivity and charge compensation on both electrodes of the cell, but also determines the energy storage (ES) performance. Before testing the device, the mass loading of both core and outer electrodes was optimized based on the following Equation (5). Figure 6a shows the digital images of Zn-Co-Se deposited on various substrates (NF, CC, CNF, and SS plate) via electrodeposition technique.…”

“…2020, 5,1900873 (1 × 3 cm 2 ) for the electrode contact and the remaining (1 × 2 cm 2 ) for the active material growth using a thread seal tape and the remaining. Mater.…”

“…[1][2][3][4][5][6][7][8][9][10] Though, several kinds of renewable energy sources have attracted great attention including, rechargeable batteries, supercapacitors (SCs), and fuel cells. [1][2][3][4][5][6][7][8][9][10] Though, several kinds of renewable energy sources have attracted great attention including, rechargeable batteries, supercapacitors (SCs), and fuel cells.…”