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Current\u2013voltage measurements and photoinduced charge carrier extraction by linear increasing voltage (photo\u2010CELIV) reveal improved charge generation and charge transport properties in these high band gap systems with increasing <jats:italic>M<\/jats:italic><jats:sub>n<\/jats:sub>, while polymers with low molecular weight suffer from diminished charge carrier extraction because of low mobility\u2013lifetime (<jats:italic>\u03bc\u03c4<\/jats:italic>) product. By combining Fourier\u2010transform photocurrent spectroscopy (FTPS) with electroluminscence spectroscopy, it is demonstrate that increasing <jats:italic>M<\/jats:italic><jats:sub>n<\/jats:sub> reduces the nonradiative recombination losses. Solar cells based on PIDTTQ with <jats:italic>M<\/jats:italic><jats:sub>n<\/jats:sub> = 58 kD feature a power conversion efficiency of 6.0% and a charge carrier mobility of 2.1 \u00d7 10<jats:sup>\u22124<\/jats:sup> cm<jats:sup>2<\/jats:sup> V<jats:sup>\u22121<\/jats:sup> s<jats:sup>\u22121<\/jats:sup> when doctor bladed in air, without the need for thermal treatment. This study exhibits the strong correlations between polymer fractionation and its optoelectronics characteristics, which informs the polymer design rules toward highly efficient organic solar cells.<\/jats:p>","DOI":"10.1002\/adfm.201501062","type":"journal-article","created":{"date-parts":[[2015,6,26]],"date-time":"2015-06-26T10:56:39Z","timestamp":1435316199000},"page":"4898-4907","source":"Crossref","is-referenced-by-count":64,"title":["Photophysics of Molecular\u2010Weight\u2010Induced Losses in Indacenodithienothiophene\u2010Based Solar Cells"],"prefix":"10.1002","volume":"25","author":[{"given":"Nicola","family":"Gasparini","sequence":"first","affiliation":[{"name":"Institute of Materials for Electronics and Energy Technology (I\u2010MEET) Friedrich\u2010Alexander\u2010University Erlangen\u2010Nuremberg  Martensstra\u00dfe 7 91058 Erlangen Germany"}]},{"given":"Athanasios","family":"Katsouras","sequence":"additional","affiliation":[{"name":"Department of Materials Science Engineering University of Ioannina  Ioannina 45110 Greece"}]},{"given":"Mamantos I.","family":"Prodromidis","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Ioannina  Ioannina 45110 Greece"}]},{"given":"Apostolos","family":"Avgeropoulos","sequence":"additional","affiliation":[{"name":"Department of Materials Science Engineering University of Ioannina  Ioannina 45110 Greece"}]},{"given":"Derya","family":"Baran","sequence":"additional","affiliation":[{"name":"Institute of Materials for Electronics and Energy Technology (I\u2010MEET) Friedrich\u2010Alexander\u2010University Erlangen\u2010Nuremberg  Martensstra\u00dfe 7 91058 Erlangen Germany"}]},{"given":"Michael","family":"Salvador","sequence":"additional","affiliation":[{"name":"Institute of Materials for Electronics and Energy Technology (I\u2010MEET) Friedrich\u2010Alexander\u2010University Erlangen\u2010Nuremberg  Martensstra\u00dfe 7 91058 Erlangen Germany"},{"name":"Instituto de Telecomunica\u00e7\u00f5es Instituto Superior T\u00e9cnico  Av. 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