Kunzmann Andreas, Gruber Marco, Casillas Rubén, Zirzlmeier Johannes, Stanzel Melanie, Peukert Wolfgang, Tykwinski Rik R, Guldi Dirk M
Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058, Erlangen, Germany.
Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger-Strasse 10, 91058, Erlangen, Germany.
Angew Chem Int Ed Engl. 2018 Aug 13;57(33):10742-10747. doi: 10.1002/anie.201801041. Epub 2018 Jul 5.
A novel pentacene dimer (P2) and a structurally analogous monomer (P1) were synthesized for use in n-type dye-sensitized solar cells. In P2, the triplet excited states formed by the rapid, spin-allowed process singlet fission were expected to enable carrier multiplication in comparison to the slow, spin-forbidden intersystem crossing seen in P1. A meta-positioning of the two pentacenes and the carboxylate anchor were chosen in P2 to balance the intramolecular dynamics of singlet fission and electron injection. Electron injection from energetically low-lying triplet excited states of pentacene units necessitated the intrinsic and extrinsic lowering of the Fermi level of the semiconductor. Indium-zinc oxide in the presence of Li was found to be the optimum choice for the photoelectrodes. Efficient electron injection from the triplet excited states of P1 and P2 was found, with a carrier multiplication of nearly 130 %.
合成了一种新型并五苯二聚体（P2）和一种结构类似的单体（P1），用于n型染料敏化太阳能电池。在P2中，与P1中缓慢的、自旋禁阻的系间窜越相比，由快速的、自旋允许的单重态裂变过程形成的三重态激发态有望实现载流子倍增。在P2中选择两个并五苯的间位定位和羧酸盐锚定基团，以平衡单重态裂变和电子注入的分子内动力学。从并五苯单元能量较低的三重态激发态进行电子注入需要半导体费米能级的内在和外在降低。发现锂存在下的铟锌氧化物是光电极的最佳选择。发现从P1和P2的三重态激发态有高效的电子注入，载流子倍增接近130%。
