A new solution-processed diketopyrrolopyrrole donor for non-fullerene small-molecule solar cells
A new solution-processed diketopyrrolopyrrole donor for non-fullerene small-molecule solar cells
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用于非富勒烯小分子太阳能电池的新型溶液加工二酮吡咯并吡咯供体
DOI：
10.1039/c3ta14335j
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发表时间：
2014-01
影响因子：
11.9
通讯作者：
Yao, Jiannian
中科院分区：
文献类型：
--
作者：
Lu, Zhenhuan;Huang, Jianhua;Zhan, Chuanlang;Yao, Jiannian
在溶液处理的非富勒烯小分子太阳能电池（NF-SMSC）中，体异质结活性层由小分子供体和非富勒烯小分子受体共混。溶液处理的小分子给体的合成与非富勒烯小分子受体的设计同样重要。本文合成了一种新的二酮基吡咯并吡咯（DPP）小分子给体DPP-BDT-T。纯的DPP-BDT-T膜覆盖从500 nm到700 nm的宽光谱，具有1.72 eV的低带隙。通过选择我们新报道的二萘嵌苯二酰亚胺（PDI）二聚体，bis-PDI-T-EG，作为非富勒烯小分子受体，最好的NF-SMSC器件显示出0.12%的低效率。当添加2%1，8-二碘辛烷（DIO）时，更多的受体分子形成π-π-堆积，相尺寸从15 nm增加到50 nm，并形成连续互穿网络。这反过来又提高了空穴和电子的迁移率（μh = 1.6 × 10− 2 vs.）。5.8？10−4 cm2 V−1 s−1，μe = 2.3？10−5vs。6.1× 10−7 cm 2 V−1 s−1），效率提高到1.6%。在另一方面，从共混物膜的荧光发射增强了10倍后，使用2%的DIO作为添加剂，这表明在供体和受体纳米结构的界面处的效率较低的光子诱导的激子分离。因此，我们的情况表明，从纳米结构界面分离的电子和空穴的有效清除对于有效的NF-SMSC起作用。
In solution-processed non-fullerene small-molecule solar cells (NF-SMSCs), the bulk-heterojunction active layer is blended by a small molecule donor and a non-fullerene small molecule acceptor. Synthesis of solution-processed small molecule donors is of the same importance as designing non-fullerene small molecule acceptors. In this paper, a new solution-processed diketopyrrolopyrrole (DPP)-based small molecule donor, namely DPP-BDT-T, was synthesized. The pure DPP-BDT-T film covers a broad spectrum from 500 nm to 700 nm with a low band gap of 1.72 eV. By choosing our newly reported perylene diimide (PDI) dimer, bis-PDI-T-EG, as the non-fullerene small molecule acceptor, the best NF-SMSC device showed a low efficiency of 0.12%. When using 2% 1,8-diiodooctane (DIO) as the additive, more acceptor molecules formed into π–π-stacks, accompanied by the increase of the phase size from 15 nm to 50 nm and the formation of continuous interpenetrating networks. This in turn enhanced the hole and electron mobilities (μh = 1.6 × 10−2vs. 5.8 × 10−4 cm2 V−1 s−1 and μe = 2.3 × 10−5vs. 6.1 × 10−7 cm2 V−1 s−1) and the efficiency was enhanced to 1.6%. In another respect, the fluorescent emission from the blend films was enhanced by 10 times after using 2% DIO as the additive, suggesting less efficient photon-induced exciton separation at the interfaces of the donor and acceptor nanostructures. Accordingly, our case suggests that efficient sweepout of the separated electrons and holes from the nanostructural interfaces plays a role for efficient NF-SMSCs.
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DOI：
10.1088/0022-3727/45/17/175101
发表时间：
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期刊：
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影响因子：
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