Dresden 2020 – wissenschaftliches Programm
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CPP 38.3: Vortrag
Dienstag, 17. März 2020, 10:00–10:15, ZEU 255
Factors Determining Charge Transfer Energetics for Organic Photovoltaics — Shahidul Alam1,2, Ulrich S. Schubert1,2, and •Harald Hoppe1,2 — 1Center for Energy and Environmental Chemistry Jena (CEEC Jena), FSU Jena, Germany — 2Laboratory of Organic and Macromolecular Chemistry (IOMC), FSU Jena, Germany
Recently, non-fullerene acceptors have received increasing attention for use in polymer-based bulk-heterojunction organic solar cells, as they have demonstrated considerably improved photovoltaic performances over classical polymer-fullerene blends. One part of the success of these materials has been attributed to an increased contribution to the overall absorption of the solar cells, thanks to relatively low bandgaps in these materials. Another part may be related to lower energy or voltage losses through closer adaptation to todays common donor polymers for organic photovoltaics. Since we like to learn more about the general applicability of non-fullerene acceptors as well as about the energy level alignment at the donor-acceptor heterojunction, we studied the latter and consequences thereof for three different donors in conjunction with classical fullerene-derivatives [6,6]-phenyl-C61/C71-butyric acid methyl ester (PCBM/PC70BM) and the exemplari non-fullerene-acceptor 2,2*-[[6,6,12,12-Tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2*,3*-d*]-s-indaceno[1,2-b:5,6-b*]dithiophene-2,8-diyl]bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis[propanedinitrile] (ITIC). We find that rather specific properties of ITIC control the solar cell performance and limit its general application.