Room-temperature solution-processed flexible photodetectors with spectral response from 300 to 2600 nm are reported. Solution-processed polymeric thin film with transparency ranging from 300 to 7000 nm and superior electrical conductivity as the transparent electrode is reported. Solutionprocessed flexible broadband photodetectors with a "vertical" device structure incorporating a perovskite/PbSe quantum dot bilayer thin film based on the above solution-processed transparent polymeric electrode are demonstrated. The utilization of perovskite/PbSe quantum dot bilayer thin film as the photoactive layer extends spectral response to infrared region and boosts photocurrent densities in both visible and infrared regions through the trap-assisted photomultiplication effect. Operated at room temperature and under an external bias of -1 V, the solution-processed flexible photodetectors exhibit over 230 mA W -1 responsivity, over 1011 cm Hz1/2/W photodetectivity from 300 to 2600 nm and ≈70 dB linear dynamic ranges. It is also found that the solution-processed flexible broadband photodetectors exhibit fast response time and excellent flexibility. All these results demonstrate that this work develop a facile approach to realize roomtemperature operated ultrasensitive solution-processed flexible broadband photodetectors with "vertical" device structure through solution-processed transparent polymeric electrode.
Lead-based organic−inorganic hybrid perovskite materials have been developed for advanced optoelectronic applications. However, the toxicity of lead and the chemical instability of lead-based perovskite materials have so far been demonstrated to be an overwhelming challenge. The discovery of perovskite materials based on low-toxicity elements, such as Sn, Bi, Sb, Ge, and Cu, with superior optoelectronic properties provides alternative approaches to realize high-performance perovskite optoelectronics. In this review, recent advances in the aspects of low-toxicity perovskite solar cells, photodetectors, light-emitting diodes, and thermoelectric devices are highlighted. The antioxidation stability of metal cation and the crystallization process of the low-toxicity perovskite materials are discussed. In the last part, the outlook toward addressing various issues requiring further attention in the development of low-toxicity perovskite materials is outlined.
Perovskite solar cells in which 2D perovskites are incorporated within a 3D perovskite network exhibit improved stability with respect to purely 3D systems, but lower record power conversion efficiencies (PCEs). Here, a breakthrough is reported in achieving enhanced PCEs, increased stability, and suppressed photocurrent hysteresis by incorporating n‐type, low‐optical‐gap conjugated organic molecules into 2D:3D mixed perovskite composites. The resulting ternary perovskite–organic composites display extended absorption in the near‐infrared region, improved film morphology, enlarged crystallinity, balanced charge transport, efficient photoinduced charge transfer, and suppressed counter‐ion movement. As a result, the ternary perovskite–organic solar cells exhibit PCEs over 23%, which are among the best PCEs for perovskite solar cells with p–i–n device structure. Moreover, the ternary perovskite–organic solar cells possess dramatically enhanced stability and diminished photocurrent hysteresis. All these results demonstrate that the strategy of exploiting ternary perovskite–organic composite thin films provides a facile way to realize high‐performance perovskite solar cells.
The abnormal angiogenesis and insufficient
oxygen supply in solid
tumors lead to intratumoral hypoxia, which severely limits the efficacy
of traditional photodynamic therapy (PDT). Here, a multifunctional
nanoplatform (ZDZP@PP) based on a zeolitic imidazolate framework-67
(ZIF-67) core as a hydrogen peroxide catalyst, a zeolitic imidazolate
framework-8 (ZIF-8) shell with a pH-responsive property, and a polydopamine–poly(ethylene
glycol) (PDA–PEG) layer for improving the biocompatibility
is fabricated for not only relieving tumor hypoxia but also enhancing
the efficacy of combination chemo–photodynamic therapy. The
chemotherapy drug doxorubicin (DOX) and photosensitizer protoporphyrin
IX (PpIX) are encapsulated in different layers independently; thus,
a unique two-stage stepwise release becomes possible. Moreover, the
nanoplatform can effectively decompose hydrogen peroxide to produce
oxygen and thus relieve tumor hypoxia, which further facilitates the
production of cytotoxic reactive oxygen species (ROS) by PpIX under
laser irradiation. Both in vitro and in vivo experimental results confirm that the combination chemo–photodynamic
therapy with the ZDZP@PP nanoplatform can provide more effective cancer
treatment than chemotherapy or PDT alone. Consequently, the oxygen
self-sufficient multifunctional nanoplatform holds promising potential
to overcome hypoxia and treat solid tumors in the future.
Responsive
nanocarriers with biocompatibility and precise drug
releasing capability have emerged as a prospective candidate for anticancer
treatment. However, the challenges imposed by the complicated preparation
process and limited loading capacities have seriously impeded the
development of novel multifunctional drug delivery systems. Here,
we developed a novel and dual-responsive nanocarrier based on a nanoscale
ZIF-8 core and an organosilica shell containing disulfide bridges
in its frameworks through a facile and efficient strategy. The prepared
ZIF-8@DOX@organosilica nanoparticles (ZDOS NPs) exhibited a well-defined
structure and excellent doxorubicin (DOX) loading capability (41.2%)
with pH and redox dual-sensitive release properties. The degradation
of the organosilica shell was observed after 12 h incubation with
a 10 mM reducing agent. Confocal imaging and flow cytometry analysis
further proved that the nanocarriers can efficiently enter cells and
complete intracellular DOX release under the low pH and high glutathione
concentrations, which resulted in an enhanced cytotoxicity of DOX
for cancer cells. Meanwhile, subcellular localization experiments
revealed that the ZDOS NPs entered cells mainly by endocytosis and
then escaped from lysosomes into the cytosol. Moreover, in vivo assays
also demonstrated that the ZDOS NPs exhibited negligible systemic
toxicity and significantly enhanced anticancer efficiencies compared
with free DOX. In summary, our prepared pH and redox dual-responsive
nanocarriers provide a potential platform for controlled release and
cancer treatment.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.