TY  - JOUR
A1  - Grüne, Jeannine
A1  - Londi, Giacomo
A1  - Gillett, Alexander J.
A1  - Stähly, Basil
A1  - Lulei, Sebastian
A1  - Kotova, Maria
A1  - Olivier, Yoann
A1  - Dyakonov, Vladimir
A1  - Sperlich, Andreas
T1  - Triplet Excitons and Associated Efficiency‐Limiting Pathways in Organic Solar Cell Blends Based on (Non‐) Halogenated PBDB‐T and Y‐Series
JF  - Advanced Functional Materials
N2  - The great progress in organic photovoltaics (OPV) over the past few years has been largely achieved by the development of non‐fullerene acceptors (NFAs), with power conversion efficiencies now approaching 20%. To further improve device performance, loss mechanisms must be identified and minimized. Triplet states are known to adversely affect device performance, since they can form energetically trapped excitons on low‐lying states that are responsible for non‐radiative losses or even device degradation. Halogenation of OPV materials has long been employed to tailor energy levels and to enhance open circuit voltage. Yet, the influence on recombination to triplet excitons has been largely unexplored. Using the complementary spin‐sensitive methods of photoluminescence detected magnetic resonance and transient electron paramagnetic resonance corroborated by transient absorption and quantum‐chemical calculations, exciton pathways in OPV blends are unravelled employing the polymer donors PBDB‐T, PM6, and PM7 together with NFAs Y6 and Y7. All blends reveal triplet excitons on the NFA populated via non‐geminate hole back transfer and, in blends with halogenated donors, also by spin‐orbit coupling driven intersystem crossing. Identifying these triplet formation pathways in all tested solar cell absorber films highlights the untapped potential for improved charge generation to further increase plateauing OPV efficiencies.
KW  - halogenation
KW  - non‐fullerene acceptors
KW  - organic photovoltaics
KW  - spin physics
KW  - triplet excitons
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-312164
VL  - 33
IS  - 12
ER  - 
TY  - JOUR
A1  - Carradec, Quentin
A1  - Pelletier, Eric
A1  - Da Silva, Corinne
A1  - Alberti, Adriana
A1  - Seeleuthner, Yoann
A1  - Blanc-Mathieu, Romain
A1  - Lima-Mendez, Gipsi
A1  - Rocha, Fabio
A1  - Tirichine, Leila
A1  - Labadie, Karine
A1  - Kirilovsky, Amos
A1  - Bertrand, Alexis
A1  - Engelen, Stefan
A1  - Madoui, Mohammed-Amin
A1  - Méheust, Raphaël
A1  - Poulain, Julie
A1  - Romac, Sarah
A1  - Richter, Daniel J.
A1  - Yoshikawa, Genki
A1  - Dimier, Céline
A1  - Kandels-Lewis, Stefanie
A1  - Picheral, Marc
A1  - Searson, Sarah
A1  - Jaillon, Olivier
A1  - Aury, Jean-Marc
A1  - Karsenti, Eric
A1  - Sullivan, Matthew B.
A1  - Sunagawa, Shinichi
A1  - Bork, Peer
A1  - Not, Fabrice
A1  - Hingamp, Pascal
A1  - Raes, Jeroen
A1  - Guidi, Lionel
A1  - Ogata, Hiroyuki
A1  - de Vargas, Colomban
A1  - Iudicone, Daniele
A1  - Bowler, Chris
A1  - Wincker, Patrick
T1  - A global ocean atlas of eukaryotic gene
JF  - Nature Communications
N2  - While our knowledge about the roles of microbes and viruses in the ocean has increased tremendously due to recent advances in genomics and metagenomics, research on marine microbial eukaryotes and zooplankton has benefited much less from these new technologies because of their larger genomes, their enormous diversity, and largely unexplored physiologies. Here, we use a metatranscriptomics approach to capture expressed genes in open ocean Tara Oceans stations across four organismal size fractions. The individual sequence reads cluster into 116 million unigenes representing the largest reference collection of eukaryotic transcripts from any single biome. The catalog is used to unveil functions expressed by eukaryotic marine plankton, and to assess their functional biogeography. Almost half of the sequences have no similarity with known proteins, and a great number belong to new gene families with a restricted distribution in the ocean. Overall, the resource provides the foundations for exploring the roles of marine eukaryotes in ocean ecology and biogeochemistry.
KW  - genomics
KW  - marine biology
KW  - microbial ecology
KW  - water microbiology
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-222250
VL  - 9
ER  -