All-Small-Molecule Nonfullerene Organic Solar Cells with High Fill Factor and High Efficiency over 10%
All-Small-Molecule Nonfullerene Organic Solar Cells with High Fill Factor and High Efficiency over 10%
复制标题
全小分子%20非富勒烯%20有机%20太阳能%20细胞%20与%20高%20填充%20因子%20和%20高%20效率%20over%2010%
DOI：
10.1021/acs.chemmater.7b02536
复制
发表时间：
2017-09-12
影响因子：
8.6
通讯作者：
Li, Yongfang
中科院分区：
文献类型：
--
作者：
Qiu, Beibei;Xue, Lingwei;Li, Yongfang
我们合成了两种具有弱吸电子酯端基的宽带隙A - D - A结构的p型有机半导体（p - OS）小分子：酯基上带有氰基（CN）的SM1和不含氰基的SM2。与不含氰基的SM2相比，SM1表现出更强的吸收、更低的最高占据分子轨道（HOMO）能级以及更高的空穴迁移率。以SM1为给体、窄带隙n - OS IDIC为受体的全小分子有机太阳能电池（SM - OSC）展现出10.11%的高功率转换效率（PCE）和73.55%的高填充因子（FF），而在相同的器件制备条件下，基于SM2:IDIC的器件的PCE仅为5.32%。基于SM1的器件的10.11%的PCE和73.55%的FF是迄今为止文献中报道的非富勒烯SM - OSCs的最高值。结果表明，SM1中的氰基取代在提高非富勒烯SM - OSC中p - OS给体的光伏性能方面起着重要作用。此外，光诱导力显微镜（PiFM）首次用于有机太阳能电池中以表征其给体/受体共混活性层的形貌。
We synthesized two wide bandgap A-D-A structured p-type organic semiconductor (p-OS) small molecules with weak electron-withdrawing ester end groups: SM1 with cyano group (CN) on the ester group and SM2 without the CN group. SM1 showed stronger absorption, lower-lying HOMO energy level, and higher hole mobility in comparison with that of SM2 without the CN groups. The all-small molecule organic solar cell (SM-OSC) with SM1 as donor and a narrow bandgap n-OS IDIC as acceptor demonstrated a high power conversion efficiency (PCE) of 10.11% and a high fill factor (FF) of 73.55%, while the PCE of the device based on SM2:IDIC is only 5.32% under the same device fabrication condition. The PCE of 10.11% and FF of 73.55% for the SM1-based device are the highest values for the nonfullerene SM-OSCs reported in the literature so far. The results indicate that the cyano substitution in SM1 plays an important role in improving the photovoltaic performance of the p-OS donors in the nonfullerene SM-OSC. In addition, the photoinduced force microscopy (PiFM) was first used in OSCs to characterize the morphology of its donor/acceptor blend active layer.