Chen Wei-Jen, Cheng Yu-Che, Kuo Da-Wei, Chen Chin-Ti, Liu Bo-Tau, Jeng Ru-Jong, Lee Rong-Ho
Department of Chemical Engineering, National Chung Hsing University Taichung 402 Taiwan
Institute of Chemistry, Academia Sinica Taipei 115 Taiwan.
RSC Adv. 2018 Sep 7;8(55):31478-31489. doi: 10.1039/c8ra05360j. eCollection 2018 Sep 5.
A novel triazole-cored, star-shaped, conjugated molecule (TDGTPA) has been synthesized for use as an electron-selective interlayer in inverted polymer solar cells (PSCs). This star-shaped molecule comprised a triazole unit as the central core, 2,5-thienyl diketopyrrolopyrrole units as π-conjugated bridges, and -butyl-substituted triphenylamine units as both end groups and donor units. The inverted PSC had the device structure indium tin oxide/ZnO/TDGTPA/poly(3-hexylthiophene) (P3HT)/fullerene derivative (PCBM)/MoO/Ag. Inserting TDGTPA as the electron-selective layer enhanced the compatibility of the ZnO-based electron transport layer and the P3HT:PCBM blend-based photoactive layer. The low energy of the lowest unoccupied molecular orbital (-3.98 eV) of TDGTPA was favorable for electron transfer from the photoactive layer to the ZnO layer, thereby enhancing the photovoltaic performance of the PSC. The photo-conversion efficiency of the device incorporating TDGTPA as the electron-selective layer was 15.8% greater than that of the corresponding device prepared without it.
一种新型的以三唑为核心的星形共轭分子（TDGTPA）已被合成，用作倒置聚合物太阳能电池（PSC）中的电子选择性中间层。这种星形分子以三唑单元为中心核，2,5-噻吩基二酮吡咯并吡咯单元为π共轭桥，丁基取代的三苯胺单元作为端基和供体单元。倒置PSC具有氧化铟锡/氧化锌/TDGTPA/聚（3-己基噻吩）（P3HT）/富勒烯衍生物（PCBM）/氧化钼/银的器件结构。插入TDGTPA作为电子选择性层增强了氧化锌基电子传输层与基于P3HT:PCBM共混物的光活性层之间的兼容性。TDGTPA最低未占据分子轨道的低能量（-3.98 eV）有利于电子从光活性层转移到氧化锌层，从而提高了PSC的光伏性能。以TDGTPA作为电子选择性层的器件的光转换效率比未使用它制备的相应器件高15.8%。
