Karl Martin Karlsson
Royal Institute of Technology
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Karl Martin Karlsson.
Angewandte Chemie | 2008
Jun-Ho Yum; Daniel P. Hagberg; Soo-Jin Moon; Karl Martin Karlsson; Tannia Marinado; Licheng Sun; Anders Hagfeldt; Mohammad Khaja Nazeeruddin; Michael Grätzel
Finely tuned: A stable dye-sensitized solar cell that contains a molecularly engineered organic dye has been prepared. The efficiency of the cell remains at 90% after 1000 h of light soaking at 60 degrees C. The remarkable stability of the cell is also reflected in the open-circuit voltage value (V(oc)), short-circuit photocurrent-density value (J(sc)), and the fill factor, which also show barely no decline (see picture).
Chemistry: A European Journal | 2011
Karl Martin Karlsson; Xiao Jiang; Susanna K. Eriksson; Erik Gabrielsson; Håkan Rensmo; Anders Hagfeldt; Licheng Sun
A series of metal-free organic dyes with a core phenoxazine chromophore have been synthesized and tested as sensitizers in dye-sensitized solar cells. Overall conversion efficiencies of 6.03-7.40% were reached under standard AM 1.5G illumination at a light intensity of 100 mW cm(-2) . A clear trend in electron lifetime could be seen; a dye with a furan-conjugated linker showed a shorter lifetime relative to dyes with the acceptor group directly attached to the phenoxazine. The addition of an extra donor unit, which bore insulating alkoxyl chains, in the 7-position of the phenoxazine could increase the lifetime even further and, together with additives in the electrolyte to raise the conduction band, an open circuit voltage of 800 mV could be achieved. From photoelectron spectroscopy and X-ray absorption spectroscopy of the dyes adsorbed on TiO(2) particles, it can be concluded that the excitation is mainly of cyano character (i.e., on average, the dye molecules are standing on, and pointing out, from the surface of TiO(2) particles).
Journal of Materials Chemistry | 2015
Peng Liu; Bo Xu; Karl Martin Karlsson; Jinbao Zhang; Nick Vlachopoulos; Gerrit Boschloo; Licheng Sun; Lars Kloo
A new organic donor–π–acceptor sensitizer MKA253 has been applied for highly efficient solid-state dye-sensitized solar cells (ssDSSCs). Using 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene (Spiro-OMeTAD) as the hole transport material (HTM), an excellent power conversion efficiency of 6.1% was recorded together with a high short-circuit current of 12.4 mA cm−2 under standard AM 1.5G illumination (100 mW cm−2). Different combinations of dyes and HTMs have also been investigated in the ssDSSC device. The results showed that small molecule HTM based devices suffer from comparably high electron recombination losses, thus causing low open-circuit voltage. In addition, photo-induced absorption (PIA) spectroscopy showed that the small-molecule HTMs lead to more efficient dye regeneration in comparison with Spiro-OMeTAD, despite a lower thermodynamic driving force. The results of this study also show that optimized energy levels for the dye–HTMs could be a vital factor for highly efficient ssDSSCs.
Journal of the American Chemical Society | 2008
Daniel P. Hagberg; Jun-Ho Yum; HyoJoong Lee; Filippo De Angelis; Tannia Marinado; Karl Martin Karlsson; Robin Humphry-Baker; Licheng Sun; Anders Hagfeldt; Michael Grätzel; Md. K. Nazeeruddin
Journal of Organic Chemistry | 2007
Daniel P. Hagberg; Tannia Marinado; Karl Martin Karlsson; Kazuteru Nonomura; Peng Qin; Gerrit Boschloo; Tore Brinck; Anders Hagfeldt; Licheng Sun
Advanced Functional Materials | 2011
Xiao Jiang; Karl Martin Karlsson; Erik Gabrielsson; Erik M. J. Johansson; Maria Quintana; Martin Karlsson; Licheng Sun; Gerrit Boschloo; Anders Hagfeldt
Physical Chemistry Chemical Physics | 2012
Lei Yang; Ute B. Cappel; E. Unger; Martin Karlsson; Karl Martin Karlsson; Erik Gabrielsson; Licheng Sun; Gerrit Boschloo; Anders Hagfeldt; Erik M. J. Johansson
Journal of Physical Chemistry C | 2009
Soo-Jin Moon; Jun-Ho Yum; Robin Humphry-Baker; Karl Martin Karlsson; Daniel P. Hagberg; Tannia Marinado; Anders Hagfeldt; Licheng Sun; Michael Grätzel; Khaja Nazeeruddin
Journal of Materials Chemistry | 2011
Haining Tian; Ilkay Bora; Xiao Jiang; Erik Gabrielsson; Karl Martin Karlsson; Anders Hagfeldt; Licheng Sun
Solar Energy | 2011
Daibin Kuang; Pascal Comte; Shaik M. Zakeeruddin; Daniel P. Hagberg; Karl Martin Karlsson; Licheng Sun; Md. K. Nazeeruddin; Michael Grätzel