D–A–A′-type asymmetric small molecules based on triphenylamine-diketopyrrolopyrrole/5,6-difluoro-2,1,3-benzothiadiazole backbone for organic photovoltaic materials
Solution-processed bulk heterojunction solar cells based on porphyrin small molecules with very low energy losses comparable to perovskite solar cells and high quantum efficiencies
to 0.94 V and a very low energy loss of only 0.53 eV. This is the first report in which small molecule-based solarcells show such a low energy loss comparable to perovskitesolarcells, while exhibiting a good PCE of about 5% and a maximum external quantum efficiency up to 61%. To further understand the effect of different processing conditions on the blend films, the morphology of the blend films was
使用卟啉核作为供体单元,以3-乙基罗丹宁和2-(1,1-二氰基亚甲基)罗丹宁为受体单元,开发了两个新的AD偶联的小分子Por-Rod和Por-CNRod。Por-Rod和Por-CNRod分别显示出高达850 nm的宽吸收,光能带隙分别为1.47和1.45 eV。另外,它们的包含PC 71 BM的共混膜的SCLC空穴迁移率分别为8.5×10 -5和7.5×10 -6 cm 2 V -1 s -1。虽然包含PC 71的块状异质结太阳能电池在不使用添加剂,仅进行热退火或仅使用吡啶的情况下处理的BM表现出非常低的功率转换效率(PCE),使用吡啶然后进行热退火处理的基于Por-Rod的太阳能电池,其PCE高达4.97%。高达0.94 V的出色V OC和仅0.53 eV的非常低的能量损耗。这是第一份报告,其中基于小分子的太阳能电池显示出与钙钛矿太阳能电池相当的低能量损耗,同时具有约5%的良好PCE和
D–A–A′-type asymmetric small molecules based on triphenylamine-diketopyrrolopyrrole/5,6-difluoro-2,1,3-benzothiadiazole backbone for organic photovoltaic materials
作者:Lunxiang Yin、Qingqing Yuan、Yanqin Li
DOI:10.1039/d0nj02239j
日期:——
Five novel asymmetric OSMs are designed and synthesized with a tuned terminal group and central core, and the effect of their structure on their photoelectrical properties are investigated.