3 research outputs found
Flexible Silver Nanowire Meshes for High-Efficiency Microtextured Organic-Silicon Hybrid Photovoltaics
Hybrid organic-silicon heterojunction solar cells promise
a significant reduction on fabrication costs by avoiding energy-intensive
processes. However, their scalability remains challenging without
a low-cost transparent electrode. In this work, we present solution-processed
silver-nanowire meshes that uniformly cover the microtextured surface
of hybrid heterojunction solar cells to enable efficient carrier collection
for large device area. We systematically compare the characteristics
and device performance with long and short nanowires with an average
length/diameter of 30 μm/115 nm and 15 μm/45 nm, respectively,
to those with silver metal grids. A remarkable power conversion efficiency
of 10.1% is achieved with a device area of 1 × 1 cm<sup>2</sup> under 100 mW/cm<sup>2</sup> of AM1.5G illumination for the hybrid
solar cells employing long wires, which represents an enhancement
factor of up to 36.5% compared to the metal grid counterpart. The
high-quality nanowire network displays an excellent spatial uniformity
of photocurrent generation via distributed nanowire meshes and low
dependence on efficient charge transport under a high light-injection
condition with increased device area. The capability of silver nanowires
as flexible transparent electrodes presents a great opportunity to
accelerate the mass deployment of high-efficiency hybrid silicon photovoltaics
via simple and rapid soluble processes
Fabrication of Flexible White Light-Emitting Diodes from Photoluminescent Polymer Materials with Excellent Color Quality
This
study developed flexible light-emitting diodes (LEDs) with
warm white and neutral white light. A simple ultraviolet flip-chip
sticking process was adopted for the pumping source and combined with
polymer and quantum dot (QD) films technology to yield white light.
The polymer-blended flexible LEDs exhibited higher luminous efficiency
than the QD-blended flexible LEDs. Moreover, the polymer-blended LEDs
achieved excellent color-rendering index (CRI) values (Ra = 96 and
R9 = 96), with high reliability, demonstrating high suitability for
special applications like accent, down, or retrofit lights in the
future. In places such as a museum, kitchen, or surgery room, its
high R9 and high CRI characteristics can provide high-quality services
13% Efficiency Hybrid Organic/Silicon-Nanowire Heterojunction Solar Cell <i>via</i> Interface Engineering
Interface carrier recombination currently hinders the performance of hybrid organic–silicon heterojunction solar cells for high-efficiency low-cost photovoltaics. Here, we introduce an intermediate 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) layer into hybrid heterojunction solar cells based on silicon nanowires (SiNWs) and conjugate polymer poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS). The highest power conversion efficiency reaches a record 13.01%, which is largely ascribed to the modified organic surface morphology and suppressed saturation current that boost the open-circuit voltage and fill factor. We show that the insertion of TAPC increases the minority carrier lifetime because of an energy offset at the heterojunction interface. Furthermore, X-ray photoemission spectroscopy reveals that TAPC can effectively block the strong oxidation reaction occurring between PEDOT:PSS and silicon, which improves the device characteristics and assurances for reliability. These learnings point toward future directions for versatile interface engineering techniques for the attainment of highly efficient hybrid photovoltaics