Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
ACS Nano. 2012 Jan 24;6(1):972-8. doi: 10.1021/nn204676j. Epub 2011 Dec 29.
We study a family of functionalized squaraine (fSQ) donors for absorbing in the near-infrared (NIR) and green spectral regions. The NIR-absorbing materials are the symmetric molecules 2,4-bis[4-(N-phenyl-1-naphthylamino)-2,6-dihydroxyphenyl]squaraine (1-NPSQ), 2,4-bis[4-(N,N-diphenylamino)-2,6 dihydroxyphenyl]squaraine, and 2,4-bis[4-(N,N-dipropylamino)-2,6-dihydroxyphenyl]squaraine. The green light absorbing donors are asymmetric squaraines, namely, 2,4-bis[4-(N,N-diphenylamino)-2,6-dihydroxyphenyl]squaraine and 2-[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]-4-diphenylamino]squaraine. Substitution of the arylamine groups enhances intermolecular packing, thereby increasing hole transport and the possibility of forming extended nanocrystalline junctions when annealed. Nanocrystalline solar cells based on fSQ and a C(60) acceptor have V(oc) = 1.0 V and fill factors 0.73 ± 0.01. Solar cells incorporating annealed 1-NPSQ films result in a power conversion efficiency of 5.7 ± 0.6% at 1 sun, AM1.5G illumination.
我们研究了一系列功能化方酸（fSQ）供体，用于吸收近红外（NIR）和绿光区域。NIR 吸收材料是对称分子 2,4-双[4-（N-苯基-1-萘基氨基）-2,6-二羟基苯基]方酸（1-NPSQ）、2,4-双[4-（N,N-二苯基氨基）-2,6-二羟基苯基]方酸和 2,4-双[4-（N,N-二丙基氨基）-2,6-二羟基苯基]方酸。绿光吸收供体是不对称方酸，即 2,4-双[4-（N,N-二苯基氨基）-2,6-二羟基苯基]方酸和 2-[4-（N,N-二异丁基氨基）-2,6-二羟基苯基]-4-二苯基氨基]方酸。芳胺基团的取代增强了分子间的堆积，从而增加了空穴传输并增加了退火时形成扩展纳米晶结的可能性。基于 fSQ 和 C（60）受体的纳米晶太阳能电池的开路电压（V(oc)）为 1.0 V，填充因子为 0.73±0.01。在 1 个太阳、AM1.5G 照明下，掺入退火 1-NPSQ 薄膜的太阳能电池的功率转换效率为 5.7±0.6%。
