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Publications associées (11)

Tailor-Making Low-Cost Spiro[fluorene-9,9 '-xanthene]-Based 3D Oligomers for Perovskite Solar Cells

Ulf Anders Hagfeldt, Jiahuan Zhang, Liang Wang, Peng Liu

The power-conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have increased rapidly from about 4% to 22% during the past few years. One of the major challenges for further improvement of the efficiency of PSCs is the lack of sufficiently good ...

Cell Press2017

A New 1,3,4-Oxadiazole-Based Hole-Transport Material for Efficient CH3NH3PbBr3 Perovskite Solar Cells

Michael Graetzel, Ulf Anders Hagfeldt, Antonio Abate

A new hole-transport material (HTM) based on the 1,3,4-oxadiazole moiety (H1) was prepared through a single-step synthetic pathway starting from commercially available products. Thanks to a deep HOMO level, H1 was used as HTM in CH3NH3PbBr3 perovskite sola ...

Wiley-V C H Verlag Gmbh2016

Strategy to Boost the Efficiency of Mixed-Ion Perovskite Solar Cells: Changing Geometry of the Hole Transporting Material

Nikolaos Vlachopoulos, Ulf Anders Hagfeldt, Jiahuan Zhang

The hole transporting material (HTM) is an essential component in perovskite solar cells (PSCs) for efficient extraction and collection of the photoinduced charges. Triphenylamine- and carbazole-based derivatives have extensively been explored as alternati ...

Amer Chemical Soc2016

Detection of Convergent Genome-Wide Signals of Adaptation to Tropical Forests in Humans

Matthieu Foll

Tropical forests are believed to be very harsh environments for human life. It is unclear whether human beings would have ever subsisted in those environments without external resources. It is therefore possible that humans have developed recent biological ...

Public Library of Science2015

Adaptive, convergent origins of the pygmy phenotype in African rainforest hunter-gatherers

Matthieu Foll, Xin Zhou

The evolutionary history of the human pygmy phenotype (small body size), a characteristic of African and Southeast Asian rainforest hunter-gatherers, is largely unknown. Here we use a genome-wide admixture mapping analysis to identify 16 genomic regions th ...

Natl Acad Sciences2014

Tuning the HOMO energy levels of organic dyes for dye-sensitized solar cells based on Br-/Br3- electrolytes

Ulf Anders Hagfeldt, Ming Cheng

A series of novel metal-free org. dyes TC301-TC310 with relatively high HOMO levels were synthesized and applied in dye-sensitized solar cells (DSCs) based on electrolytes that contain Br-/Br3- and I-/I3-. The effects of additive Li+ ions and the HOMO leve ...

2010

Insight from First-Principles Calculations into the Interactions between Hydroxybenzoic Acids and Alkali Chloride Surfaces

Wei Chen

Tuning of effective band gaps at insulator surfaces by adsorbed molecules is of fundamental interest but also technologically relevant for contact charging induced by adsorbed molecules like hydroxybenzoic acids. Our studies by density functional theory of ...

American Chemical Society2010

RAFT homo- and copolymerization of N-acryloyl-morpholine, piperidine, and azocane and their self-assembled structures

Davide Demurtas, Jeffrey Alan Hubbell, Yun Suk Jo, Jay Gantz

We present new polymeric amphiphiles derived from N-acryloyl derivatives of the cyclic secondary amines: morpholine, piperidine, and azocane polymerized by reversible addition -fragmentation transfer (RAFT) polymerization. Both homopolymerization and block ...

2008

Offset Profiles of Selective Pulses in Isotopically Labeled Macromolecules

Geoffrey Bodenhausen

The exptl. verification of offset profiles and calibration of selective pulses in NMR is usually carried out with doped water samples but not under conditions typical of macromols. with short T2, long T1, and possibly homo- and heteronuclear couplings. A n ...

1999

Pyranosyl-RNA ('p-RNA'): base-pairing selectivity and potential to replicate

A review and discussion, with 42 refs. Base pairing in p-RNA (b-D-ribopyranosyl-(4'->2')-oligonucleotides) is not only stronger than in DNA and RNA, but also more selective in the sense that it is strictly confined to the Watson-Crick mode. Homopurine sequ ...

1995

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