Efficient polymer solar cells with a solution-processed and thermal annealing-free RuO2 anode buffer layer

Fuzhi Wang; Qi Xu; Zhan'ao Tan; Liangjie Li; Shusheng Li; Xuliang Hou; Gang Sun; Xiaohe Tu; Jianhui Hou; Yongfang Li

doi:10.1039/C3TA13680A

Efficient polymer solar cells with a solution-processed and thermal annealing-free RuO₂ anode buffer layer†

Fuzhi Wang,^a Qi Xu,^a Zhan'ao Tan,*^a Liangjie Li,^a Shusheng Li,^a Xuliang Hou,^a Gang Sun,^a Xiaohe Tu,^a Jianhui Hou^b and Yongfang Li*^b

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* Corresponding authors

^a State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China
E-mail: tanzhanao@ncepu.edu.cn

^b Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
E-mail: liyf@iccas.ac.cn

Abstract

A new method is developed to prepare RuO₂ films through UVO treatment of solution-processed ruthenium(III) acetylacetonate (Ru(acac)₃) without thermal annealing. By introducing RuO₂ as an anode buffer layer, highly efficient polymer solar cells (PSCs) have been achieved. The resultant RuO₂ layer exhibits high light transmittance in the visible range. Remarkable improvements in the short-circuit current density (J_sc) of the PSCs can be achieved upon the introduction of the RuO₂ buffer layer. The PSCs with the RuO₂ anode buffer layer demonstrate improved photovoltaic performance in comparison with the devices using poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) as the anode buffer layer. The power conversion efficiency (PCE) of the PSCs based on P3HT:PCBM and P3HT:ICBA reaches as high as 4.19% and 7.07%, respectively. An even higher PCE of 7.45% is realized by adopting a new conjugated polymer, PBDTBDD, as the donor. The results demonstrate that RuO₂ has great potential as a hole collection material for highly efficient PSCs.

Journal of Materials Chemistry A

Efficient polymer solar cells with a solution-processed and thermal annealing-free RuO₂ anode buffer layer†

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Efficient polymer solar cells with a solution-processed and thermal annealing-free RuO₂ anode buffer layer

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Journal of Materials Chemistry A