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High-photovoltage all-polymer solar cells based on a diketopyrrolopyrrole-isoindigo acceptor polymer

Zhaojun Li (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Xiaofeng Xu (Institutionen för kemi och kemiteknik, Polymerteknologi) ; W. Zhang ; Z. Genene ; W. Mammo ; A. Yartsev ; M. R. Andersson ; R. A. J. Janssen ; Ergang Wang (Institutionen för kemi och kemiteknik, Polymerteknologi)
Journal of Materials Chemistry A (2050-7488). Vol. 5 (2017), 23, p. 11693-11700.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Field-Effect Transistors, High-Performance, Conversion Efficiency, Conjugated Polymers, Electron-Acceptor, Blend Morphology, Diimide, Polymer, Building-Block, Energy-Loss, Semiconductors

Denna post skapades 2017-08-10.
CPL Pubid: 251016


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Institutionen för kemi och kemiteknik, Polymerteknologi



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