Department of Chemical Engineering , Pohang University of Science and Technology , Pohang 37673 , Korea.
Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Aug 1;10(30):25570-25579. doi: 10.1021/acsami.8b06445. Epub 2018 Jul 19.
Ternary blending is an effective strategy for broadening the absorption range of the active layer in bulk heterojunction polymer solar cells and for constructing an efficient cascade energy landscape at the donor/acceptor interface to achieve high efficiencies. In this study, we report efficient ternary blend solar cells containing an acceptor alloy consisting of the indacenodithiophene-based nonfullerene material, IDT2BR, and the fullerene material, phenyl-C-butyric acid methyl ester (PCBM). The IDT2BR materials mix fully with PCBM materials, and the energy state of this phase can be tuned by varying the blending ratio. We performed photoluminescence and external quantum efficiency studies and found that the ternary charge cascade structure efficiently transfers the photogenerated charges from the polymer to IDT2BR and finally to PCBM materials. Ternary blend devices containing the IDT2BR:PCBM acceptor blend and various types of donor polymers were found to exhibit power conversion efficiencies (PCEs) improved by more than 10% over the PCEs of the binary blend devices.
三元共混是一种有效的策略，可以拓宽体异质结聚合物太阳能电池活性层的吸收范围，并在给体/受体界面构建有效的级联能量景观，以实现高效率。在这项研究中，我们报告了含有受主共混物的高效三元共混太阳能电池，该受主共混物由基于茚并二噻吩的非富勒烯材料 IDT2BR 和富勒烯材料苯并[C]丁酸甲酯（PCBM）组成。IDT2BR 材料与 PCBM 材料完全混合，并且可以通过改变共混比来调整该相的能量状态。我们进行了光致发光和外量子效率研究，发现三元电荷级联结构有效地将光生电荷从聚合物转移到 IDT2BR，最后转移到 PCBM 材料。发现含有 IDT2BR:PCBM 受主共混物和各种类型给体聚合物的三元共混器件的功率转换效率（PCE）比二元共混器件的 PCE 提高了 10%以上。
