Exploring new materials to manipulate luminescent radiation and investigate the interaction of light and matter is one of the most compelling prospects of our century. Supramolecular chemistry has unraveled the opportunity to synergistically combine the chemical and optoelectronic properties of the most diverse classes of compounds. Among these, terpyridines have acted as pivotal ligand units that enable selfassembly of multicomponent chromophoric systems. In this review we therefore elucidate the metal-coordinating ability of [a]
We demonstrate a
monolithic tandem solar cell by sequentially depositing
a higher-bandgap (2.3 eV) CH3NH3PbBr3 subcell and a lower-bandgap (1.55 eV) CH3NH3PbI3 subcell bandgap perovskite cells, in conjugation
with a solution-processed organic charge carrier recombination layer,
which serves to protect the underlying subcell and allows for voltage
addition of the two subcells. Owing to the low-loss series connection,
we achieve a large open-circuit voltage of 1.96 V. Through optical
and electronic modeling, we estimate the feasible efficiency of this
device architecture to be 25.9%, achievable with integrating a best-in-class
CH3NH3PbI3 sub cell and a 2.05 eV
wide bandgap perovskite cell with an optimized optical structure.
Compared to previous reported all-perovskite tandem cells, we solely
employ Pb-based perovskites, which although have wider band gap than
Sn based perovskites, are not at risk of instability due to the unstable
charge state of the Sn2+ ion. Additionally, the bandgap
combination we use in this study could be an advantage for triple
junction cells on top of silicon. Our findings indicate that wide
band gap all-perovskite tandems could be a feasible device structure
for higher efficiency perovskite thin-film solar cells.
Solar-to-chemical (STC) energy conversion is the fundamental process that nurtures Earth's ecosystem, fixing the inexhaustible solar resource into chemical bonds. Photochemical synthesis endowsp lants with the primarys ubstances for their development;l ikewise, an artificial mimic of natural systems has long sought to support human civilization in as ustainable way.I ntensive efforts have demonstrated light-triggered productiono fd ifferent solar fuels, such as H 2 ,C O, CH 4 and NH 3 , while research on oxidative half-reactions has built up from O 2 generation to organic synthesis, waste degradation and photoreforming. Nevertheless, while extensive utilization of the radiant chemical potentialt op romote am anifold of endergonic processesi st he common thread of such research, exploration of the chemical space is fragmented by the lack of ac ommon languagea cross different scientific disciplines. Focusing on colloidal semiconductor materials, this Viewpoint discusses an inclusive protocol for the discoverya nd assessment of STC redox reactions, aiming to establish photon-to-molecule conversion as the ultimate paradigm beyondf ossil energy exploitation.
Carbon-heteroatom cross-coupling reactions are significant for numerous industrial chemical processes, in particular for the synthesis of pharmaceuticals, agrochemicals, and biologically active compounds. Photocatalyst/transition metal dual catalytic systems pave a new avenue for organic cross-coupling reactions. Specifically, the use of semiconductor nanoparticles as heterogeneous light sensitizers is highly beneficial for industrial-scale applications owing to their low-cost production, tunable photophysical properties, facile separation, high photostability, and recyclability. Here, CdSe@CdS nanorod photocatalysts are combined with a Ni complex catalyst for the promotion of selective light-induced CÀ O cross-coupling reac-tions between aryl halides and alkyl carboxylic acids. This efficient dual photocatalytic system displays a high yield ( 96 %), with an impressive turnover number (TON) of over 3 × 10 6 , and within a relatively short reaction time as a result of high turnover frequency (TOF) of ~56 s À 1 . In addition, the nanorod photocatalysts harness light with improved solar to product efficiency compared to alternative systems, signaling towards potential solar-powered chemistry. A reaction mechanism involving energy transfer from the nanorods to the Ni complex is proposed and discussed, along with specific benefits of the seeded rod morphology.
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