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11.
Birara Muluken Gebremeskel Gebeyehu Belay 《Multimedia Tools and Applications》2022,81(17):24377-24397
Multimedia Tools and Applications - The method of automatic lip motion recognition is an essential input for visual speech detection. It is a technological approach to demystify people who are hard... 相似文献
12.
D. Gebeyehu B. Maennig J. Drechsel K. Leo M. Pfeiffer 《Solar Energy Materials & Solar Cells》2003,79(1):393
We present a systematic study on photovoltaic devices that combine an organic small molecule photoactive donor–acceptor bulk heterojunction system with controlled doping of the charge transport layers. The doped transport layers are formed using high vacuum co-evaporation deposition technique (i.e. co-sublimation of matrix and dopant). Solar cell devices have been fabricated based on zinc-phthalocyanine (ZnPc) as donor (D) and fullerene (C60) as electron acceptor (A) with doped charge transport layers. The cells show a short circuit current, Isc=1.5 mA/cm2, an open circuit voltage, Voc=450 mV, a fill factor, FF=0.5, and a power conversion efficiency, ηe=3.37% under
sun (10 mW/cm2) white light illumination. In addition, these bulk-heterojunction photovoltaic devices were characterized under 1 sun (100 mW/cm2) white light illumination showing Isc=6.3 mA/cm2, Voc=500 mV, and ηe=1.04%. We have observed that the performance of such ‘bulk-heterojunction’ photovoltaic devices is critically dependent on the transport properties of the interpenetrating network D/A system and doped charge transport layers. 相似文献
13.
Habtamu Gebeyehu Menge Nghia Dinh Huynh Kyungwho Choi Chungyeon Cho Dukhyun Choi Yong Tae Park 《Advanced functional materials》2023,33(7):2210571
Harvesting sustainable energy opens new avenues for powering portable electronic devices using triboelectric nanogenerators (TENGs). Synthetic metals and polymers are used to construct most of the TENGs. Hence, ultrathin, free-standing, translucent, and chemically bonded chitosan (CH)- and alginate (AL)-based biopolymeric films are introduced here. These films are fabricated using a low-cost and environmentally friendly layer-by-layer (LbL) self-assembly method and impregnated with AgNO3 (S) in the final fabrication step (denoted as [(CH/AL)n:(CHS/AL)1]n+1). The LbL-assembled film displays remarkable antimicrobial and triboelectric properties, demonstrating a new type of TENG that is implantable in the body. By varying the number of CH and AL depositions, the dependence of TENG behaviors on thickness is investigated. It is demonstrated that a 0.87-µm-thick [CH/AL]8 TENG resulted in the highest electrical output performance of 474 V and 36.9 mA m−2 due to the highest surface potential and the lowest work function of 239.4 mV and 4.2 eV, respectively. A free-standing [(CH/AL)49:(CHS/AL)1]50 TENG is designed for antimicrobial skin-patchable shape-adaptive nanogenerators, displaying ultrahigh translucency, long-term mechanical stability, and exceptional versatility. It is then attached to the arm to detect external stimuli, and the feasibility of its use as an encodable skin-touch sensor is demonstrated. 相似文献