16 documents found, page 1 of 2
Suppression of back electron recombination on the photoanode-electrolyte interf...
Daniela F. S. L. Rodrigues; Jorge Martins; Frédéric SAUVAGE; Carlos M.R. Abreu; Jorge F.J. Coelho; Arménio C. Serra; Dzmitry Ivanou; Adélio MendesDye-sensitized solar cells (DSSC) are one of the most intensively developing PV technology to meet the emerging needs of wireless power for billions of IoT devices and wireless electronics; DSSCs have recently entered the indoor PV market. Suppressors of back electron recombination on the photoanode-electrolyte interface, also known as co-adsorbents, are key components of the DSSCs to obtain high power conversi...
Decal Ni mesh to enhance the conductivity of carbon back contacts in dye sensit...
Jorge Martins; Marat Perira; Seyedali Emami; Dzmitry Ivanou; Adélio MendesDye-sensitized solar cells (DSSCs) and perovskite solar cells (PSCs) are photovoltaic (PV) technologies that originally utilized precious metals like gold, silver, and platinum as counter-electrodes. Carbon materials are a low-cost alternative to traditional metal counter-electrodes in monolithic-DSSCs (M-DSSCs) and PSCs. However, the drawback of carbon-based counter-electrodes is that they often show a low ele...
PEROVSKITE SOLAR CELL, METHODS AND USES THEREOF
Dzmitry Ivanou; Adélio Mendes; Seyedali Emami; Eliana Teresa Coelho LoureiroThe present disclosure relates a process for immobilization of soluble lead compounds in perovskite solar cells in the case of the cell breakage or of fire by introducing the additives in the cells. The said additives in the presence of water interact with lead-based components of the perovskite cell via ion-exchange reaction forming less soluble compounds with higher thermal stability. The less soluble lead co...
Improved Interfacial Electron Dynamics with Block Poly(4-vinylpyridine)-Poly(st...
Daniela Rodrigues; Carlos M. R. Abreu; Frédéric Sauvage; Jorge F. J. Coelho; Arménio C. Serra; Dzmitry Ivanou; Adélio MendesDye-sensitized solar cells (DSSCs) have recently entered the market for indoor photovoltaics. Fast electron injection from dye to titania, the lifetime of the excited dye, and the suppression of back electron recombination at the photoanode/electrolyte interface are crucial for a high photocurrent conversion efficiency (PCE). This study presents block copolymers of poly(4-vinylpyridine) and poly(styrene)-P4VP(6...
Push-Pull Heterocyclic Dyes Based on Pyrrole and Thiophene: Synthesis and Evalu...
Sara S. M. Fernandes; Maria Cidália R. Castro; Dzmitry Ivanou; Adélio Mendes; Maria Manuela M. RaposoThree heterocyclic dyes were synthesized having in mind the changes in the photovoltaic, optical and redox properties by functionalization of 5-aryl-thieno[3,2-b]thiophene, 5-arylthiophene and bis-methylpyrrolylthiophene pi-bridges with different donor, acceptor/anchoring groups. Knoevenagel condensation of the aldehyde precursors with 2-cyanoacetic acid was used to prepare the donor-acceptor functionalized het...
A review of the techniques to measure the hermeticity of glass frit encapsulate...
Jorge Martins; Dzmitry Ivanou; Adélio MendesEmerging 3rd generation photovoltaic technologies such as perovskite and dye-sensitized solar cells are very attractive for commercialization mainly due to their low-cost materials and fabrication processes. The main drawback of these devices is their poor long-term stability. To increase the long-term stability of these devices, a hermetic encapsulation is required. The hermeticity of encapsulated devices are ...
Efficient Liquid-Junction Monolithic Cobalt-Mediated Dye-Sensitized Solar Cells...
Fátima Santos; Carolina Hora; Dzmitry Ivanou; Adélio MendesDue to the extremely high power conversion efficiency under indoor light, aesthetic appeal, and safety, the mature technology of dye-sensitized solar cells (DSSCs) is now considered as one of the most budding technologies to address the fast-growing need for cordless power in countless IoT devices and wireless sensors. The monolithic design of DSSCs (M-DSSCs) is technologically attractive for commercial product...
Passivation of the TiO2 Surface and Promotion of N719 Dye Anchoring with Poly(4...
Daniela Rodrigues; Fátima Santos; Carlos Abreu; Jorge Coelho; Arménio Serra; Dzmitry Ivanou; Adélio MendesDye-sensitized solar cells (DSSCs) have turned to be the most promising PV technology for indoor applications, for sustainable powering billions of IoT devices and wireless indoor sensors; DSSCs are aesthetic, cheap, and safe, and they display extremely high power conversion efficiencies (PCEs). In this study, poly(4-vinylpyridine) (P4VP) of molecular weights (MW) ranging from 2.8 to 18.5k was prepared by rever...
Impact of the architecture of dye sensitized solar cell-powered electrochromic ...
Dzmitry Ivanou; Jorge Pinto; Joaquim Mendes; Adélio Mendes; Claúdia CostaThe functional layers arrangement in a dye sensitized solar cell electrochromic device (DSSC-EC) on the energy conversion efficiency and on the ability to change the color is studied. The highest power conversion efficiency of ca. 7% and good color change in closed circuit conditions was observed with electrochromic WO3 deposited on the counter-electrode of the DSSC. When WO3 layer was applied over the photoano...
Incident Angle and Light Intensity Variation: a Comparative Impact Study on Per...
Verena Stockhausen; Dzmitry Ivanou; Luísa Andrade; Bernd Stannowski; Adélio MendesTo make the concept of building-integrated solar cells viable, the latter should possess an increased tolerance towards light incident angle and intensity that naturally change along the day, among other required properties. In this work, three solar cell technologies as candidates for building-integrated applications are compared regarding their normalized average efficiency as a function of light intensity an...