7 research outputs found
Cooptimization of Adhesion and Power Conversion Efficiency of Organic Solar Cells by Controlling Surface Energy of Buffer Layers
Here, we demonstrate
the cooptimization of the interfacial fracture energy and power conversion
efficiency (PCE) of polyÂ[<i>N</i>-9′-heptadecanyl-2,7-carbazole-<i>alt</i>-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)]
(PCDTBT)-based organic solar cells (OSCs) by surface treatments of
the buffer layer. The investigated surface treatments of the buffer
layer simultaneously changed the crack path and interfacial fracture
energy of OSCs under mechanical stress and the work function of the
buffer layer. To investigate the effects of surface treatments, the
work of adhesion values were calculated and matched with the experimental
results based on the Owens–Wendt model. Subsequently, we fabricated
OSCs on surface-treated buffer layers. In particular, ZnO layers treated
with polyÂ[(9,9-bisÂ(3′-(<i>N</i>,<i>N</i>-dimethylÂamino)Âpropyl)-2,7-fluorene)-<i>alt</i>-2,7-(9,9-dioctylfluorene)]
(PFN) simultaneously satisfied the high mechanical reliability and
PCE of OSCs by achieving high work of adhesion and optimized work
function
Mechanical Properties of Polymer–Fullerene Bulk Heterojunction Films: Role of Nanomorphology of Composite Films
This
paper reports the tensile properties and fracture mechanism
of PTB7:PC<sub>71</sub>BM bulk heterojunction (BHJ) films as a function
of composition mixing ratio. An increased concentration of fullerene
makes the BHJ films stiffer and more brittle, and fracture occurs
along aggregated fullerene domain boundaries. The tensile strength
is maximized at a polymer–fullerene content ratio of 1:1. Furthermore,
an additive, 1,8-diiodoctane (DIO), in the films induces fine nanomorphology,
which increases the stiffness and strength and reduces the ductility
of the films further. This is especially true under a high PC<sub>71</sub>BM load due to the expanded interfacial surface areas between
the PC<sub>71</sub>BM and PTB7 polymer domains. The photovoltaic performance
of the BHJ films on polydimethylsiloxane (PDMS) substrates after tensile
stretching cycles is also examined in detail
Wearable Textile Battery Rechargeable by Solar Energy
Wearable electronics represent a
significant paradigm shift in
consumer electronics since they eliminate the necessity for separate
carriage of devices. In particular, integration of flexible electronic
devices with clothes, glasses, watches, and skin will bring new opportunities
beyond what can be imagined by current inflexible counterparts. Although
considerable progresses have been seen for wearable electronics, lithium
rechargeable batteries, the power sources of the devices, do not keep
pace with such progresses due to tenuous mechanical stabilities, causing
them to remain as the limiting elements in the entire technology.
Herein, we revisit the key components of the battery (current collector,
binder, and separator) and replace them with the materials that support
robust mechanical endurance of the battery. The final full-cells in
the forms of clothes and watchstraps exhibited comparable electrochemical
performance to those of conventional metal foil-based cells even under
severe folding–unfolding motions simulating actual wearing
conditions. Furthermore, the wearable textile battery was integrated
with flexible and lightweight solar cells on the battery pouch to
enable convenient solar-charging capabilities
Wearable Textile Battery Rechargeable by Solar Energy
Wearable electronics represent a
significant paradigm shift in
consumer electronics since they eliminate the necessity for separate
carriage of devices. In particular, integration of flexible electronic
devices with clothes, glasses, watches, and skin will bring new opportunities
beyond what can be imagined by current inflexible counterparts. Although
considerable progresses have been seen for wearable electronics, lithium
rechargeable batteries, the power sources of the devices, do not keep
pace with such progresses due to tenuous mechanical stabilities, causing
them to remain as the limiting elements in the entire technology.
Herein, we revisit the key components of the battery (current collector,
binder, and separator) and replace them with the materials that support
robust mechanical endurance of the battery. The final full-cells in
the forms of clothes and watchstraps exhibited comparable electrochemical
performance to those of conventional metal foil-based cells even under
severe folding–unfolding motions simulating actual wearing
conditions. Furthermore, the wearable textile battery was integrated
with flexible and lightweight solar cells on the battery pouch to
enable convenient solar-charging capabilities
Wearable Textile Battery Rechargeable by Solar Energy
Wearable electronics represent a
significant paradigm shift in
consumer electronics since they eliminate the necessity for separate
carriage of devices. In particular, integration of flexible electronic
devices with clothes, glasses, watches, and skin will bring new opportunities
beyond what can be imagined by current inflexible counterparts. Although
considerable progresses have been seen for wearable electronics, lithium
rechargeable batteries, the power sources of the devices, do not keep
pace with such progresses due to tenuous mechanical stabilities, causing
them to remain as the limiting elements in the entire technology.
Herein, we revisit the key components of the battery (current collector,
binder, and separator) and replace them with the materials that support
robust mechanical endurance of the battery. The final full-cells in
the forms of clothes and watchstraps exhibited comparable electrochemical
performance to those of conventional metal foil-based cells even under
severe folding–unfolding motions simulating actual wearing
conditions. Furthermore, the wearable textile battery was integrated
with flexible and lightweight solar cells on the battery pouch to
enable convenient solar-charging capabilities
Wearable Textile Battery Rechargeable by Solar Energy
Wearable electronics represent a
significant paradigm shift in
consumer electronics since they eliminate the necessity for separate
carriage of devices. In particular, integration of flexible electronic
devices with clothes, glasses, watches, and skin will bring new opportunities
beyond what can be imagined by current inflexible counterparts. Although
considerable progresses have been seen for wearable electronics, lithium
rechargeable batteries, the power sources of the devices, do not keep
pace with such progresses due to tenuous mechanical stabilities, causing
them to remain as the limiting elements in the entire technology.
Herein, we revisit the key components of the battery (current collector,
binder, and separator) and replace them with the materials that support
robust mechanical endurance of the battery. The final full-cells in
the forms of clothes and watchstraps exhibited comparable electrochemical
performance to those of conventional metal foil-based cells even under
severe folding–unfolding motions simulating actual wearing
conditions. Furthermore, the wearable textile battery was integrated
with flexible and lightweight solar cells on the battery pouch to
enable convenient solar-charging capabilities
Wearable Textile Battery Rechargeable by Solar Energy
Wearable electronics represent a
significant paradigm shift in
consumer electronics since they eliminate the necessity for separate
carriage of devices. In particular, integration of flexible electronic
devices with clothes, glasses, watches, and skin will bring new opportunities
beyond what can be imagined by current inflexible counterparts. Although
considerable progresses have been seen for wearable electronics, lithium
rechargeable batteries, the power sources of the devices, do not keep
pace with such progresses due to tenuous mechanical stabilities, causing
them to remain as the limiting elements in the entire technology.
Herein, we revisit the key components of the battery (current collector,
binder, and separator) and replace them with the materials that support
robust mechanical endurance of the battery. The final full-cells in
the forms of clothes and watchstraps exhibited comparable electrochemical
performance to those of conventional metal foil-based cells even under
severe folding–unfolding motions simulating actual wearing
conditions. Furthermore, the wearable textile battery was integrated
with flexible and lightweight solar cells on the battery pouch to
enable convenient solar-charging capabilities