Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
University of Chinese Academy of Sciences , Beijing 100049, China.
J Am Chem Soc. 2017 Feb 8;139(5):1958-1966. doi: 10.1021/jacs.6b11612. Epub 2017 Jan 24.
A new organic small molecule, DRTB-T, that incorporates a two-dimensional trialkylthienyl-substituted benzodithiophene core building block was designed and synthesized. DRTB-T has a band gap (E) of 2.0 eV with a low-lying highest occupied molecular orbital (HOMO) level of -5.51 eV. Nonfullerene small-molecule solar cells consisting of DRTB-T and a nonfullerene acceptor (IC-C6IDT-IC) were constructed, and the morphology of the active layer was fine-tuned by solvent vapor annealing (SVA). The device showed a record 9.08% power conversion efficiency (PCE) with a high open-circuit voltage (V = 0.98 V). This is the highest PCE for a nonfullerene small-molecule organic solar cell (NFSM-OSC) reported to date. Our notable results demonstrate that the molecular design of a wide band gap (WBG) donor to create a well-matched donor-acceptor pair with a low band gap (LBG) nonfullerene small-molecule acceptor, as well as subtle morphological control, provides great potential to realize high-performance NFSM-OSCs.
一种新的有机小分子 DRTB-T 被设计和合成，它包含一个二维三烷基噻吩取代的苯并二噻吩核心构建块。DRTB-T 的带隙（E）为 2.0 eV，具有低的最高占据分子轨道（HOMO）能级为-5.51 eV。由 DRTB-T 和非富勒烯受体（IC-C6IDT-IC）组成的非富勒烯小分子太阳能电池，通过溶剂蒸气退火（SVA）精细调整活性层的形态。该器件的功率转换效率（PCE）达到了创纪录的 9.08%，开路电压（V = 0.98 V）很高。这是迄今为止报道的非富勒烯小分子有机太阳能电池（NFSM-OSC）的最高 PCE。我们的显著结果表明，通过设计一个宽带隙（WBG）给体来创建与低带隙（LBG）非富勒烯小分子受体相匹配的施主-受体对，以及对细微形态的控制，为实现高性能 NFSM-OSC 提供了巨大的潜力。
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