期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 23, 页码 11693-11700出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta09379e
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资金
- EU project OSNIRO [607585]
- EU project SUNFLOWER [FP7-ICT-2011-7, 287594]
- Swedish Research Council
- Swedish Research Council Formas
- Swedish Energy Agency
- Chalmers Area of Advanced Energy
- European Research Council under European Union/ERC [339031]
- Ministry of Education, Culture, and Science (NWO Gravity program) [024.001.035]
- Knut and Alice Wallenberg foundation
- Crafoord foundation
- International Science Programme (ISP), Uppsala University, Sweden
- European Union under REA grant [608743]
In this work, we synthesized and characterized two new n-type polymers PTDPP-PyDPP and PIID-PyDPP. The former polymer is composed of pyridine-flanked diketopyrrolopyrrole (PyDPP) and thiophene-flanked diketopyrrolopyrrole (TDPP). The latter polymer consists of PyDPP and isoindigo (IID). PIID-PyDPP exhibits a much higher absorption coefficient compared to the widely used naphthalene diimide (NDI)-based acceptor polymers, and its high-lying LUMO level affords it to achieve a high open-circuit voltage (V-oc). As a result, an all-polymer solar cell (all-PSC) fabricated from a high band gap polymer PBDTTS-FTAZ as the donor and PIID-PyDPP as the acceptor attained a high V-oc of 1.07 V with a power conversion efficiency (PCE) of 4.2%. So far, it has been one of the highest PCEs recorded from all-PSCs using diketopyrrolopyrrole (DPP)-based acceptors. Gratifyingly, no obvious PCE decay was observed in two weeks, unraveling good stability of the all-PSC. This work demonstrates that the electron-withdrawing PyDPP unit can be a promising building block for new acceptor polymers in all-PSCs.
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