Interface passivation using ultrathin polymer–fullerene films for high-efficiency perovskite solar cells with negligible hysteresis

Jun Peng; Yiliang Wu; Wang Ye; Daniel A. Jacobs; Heping Shen; Xiao Fu; Yimao Wan; The Duong; Nandi Wu; Chog Barugkin; Hieu T. Nguyen; Dingyong Zhong; Juntao Li; Teng Lu; Yun Liu; Mark N. Lockrey; Klaus J. Weber; Kylie R. Catchpole; Thomas P. White

doi:10.1039/C7EE01096F

Interface passivation using ultrathin polymer–fullerene films for high-efficiency perovskite solar cells with negligible hysteresis†

Jun Peng,

*^a Yiliang Wu,^a Wang Ye,^b Daniel A. Jacobs,

^a Heping Shen,^a Xiao Fu,

^a Yimao Wan,^a The Duong,^a Nandi Wu,^a Chog Barugkin,^a Hieu T. Nguyen,^a Dingyong Zhong,^b Juntao Li,^b Teng Lu,^c Yun Liu,^c Mark N. Lockrey,^d Klaus J. Weber,^a Kylie R. Catchpole^a and Thomas P. White

*^ab

Author affiliations

* Corresponding authors

^a Research School of Engineering, The Australian National University, Canberra, ACT, Australia
E-mail: u5686151@anu.edu.au, pengjun.88.81@gmail.com, thomas.white@anu.edu.au

^b State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China

^c Research School of Chemistry, The Australian National University, Canberra, ACT, Australia

^d Australian National Fabrication Facility, Department of Electronic Materials Engineering, Research School of Physics & Engineering, The Australian National University, Canberra, ACT, Australia

Abstract

Interfacial carrier recombination is one of the dominant loss mechanisms in high efficiency perovskite solar cells, and has also been linked to hysteresis and slow transient responses in these cells. Here we demonstrate an ultrathin passivation layer consisting of a PMMA:PCBM mixture that can effectively passivate defects at or near to the perovskite/TiO₂ interface, significantly suppressing interfacial recombination. The passivation layer increases the open circuit voltage of mixed-cation perovskite cells by as much as 80 mV, with champion cells achieving V_oc ∼ 1.18 V. As a result, we obtain efficient and stable perovskite solar cells with a steady-state PCE of 20.4% and negligible hysteresis over a large range of scan rates. In addition, we show that the passivated cells exhibit very fast current and voltage response times of less than 3 s under cyclic illumination. This new passivation approach addresses one of the key limitations of current perovskite cells, and paves the way to further efficiency gains through interface engineering.

Energy & Environmental Science

Interface passivation using ultrathin polymer–fullerene films for high-efficiency perovskite solar cells with negligible hysteresis†

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Interface passivation using ultrathin polymer–fullerene films for high-efficiency perovskite solar cells with negligible hysteresis

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