16November2018

Nano-Micro Letters

Efficient Carbon-Based CsPbBr3 Inorganic Perovskite Solar Cells by Using Cu-Phthalocyanine as Hole Transport Material

Zhiyong Liu1, Bo Sun1, Xingyue Liu1, Jinghui Han1, Haibo Ye1, Tielin Shi1, Zirong Tang1, Guanglan Liao1, 2, *

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Nano-Micro Lett. (2018) 10: 34

First Online: 26 December 2017 (Article)

DOI:10.1007/s40820-018-0187-3

*Corresponding author. E-mail: xusy@pku.edu.cn; lmpeng@pku.edu.cn

 

Abstract

 


Fig. 1 a Schematic cross-sectional view of the CuPc-based CsPbBr3 PSC with a printable low-temperature carbon electrode. b Schematic energy level alignment at interfaces. EVAC is the vacuum energy, EC is the conduction band edges, EF is the Fermi levels and EV is the valence band edges. c Schematic illustration of proposed band bending at interfaces

Metal halide perovskite solar cells (PSCs) have attracted extensive research interest for next-generation solution-processed photovoltaic devices because of their high solar-to-electric power conversion efficiency (PCE) and low fabrication cost. Although the world’s best PSC successfully achieves a considerable PCE of over 20% within a very limited timeframe after intensive efforts, the stability, high cost, and up-scaling of PSCs still remain issues. Recently, inorganic perovskite material, CsPbBr3, is emerging as a promising photo-sensitizer with excellent durability and thermal stability, but the efficiency is still embarrassing. In this work, we intend to address these issues by exploiting CsPbBr3 as light absorber, accompanied by using Cu-Phthalocyanine (CuPc) as hole transport material (HTM) and carbon as counter electrode. The optimal device acquires a decent PCE of 6.21%, over 60% higher than those of the HTM-free devices. The systematic characterization and analysis reveal a more effective charge transfer process and a suppressed charge recombination in PSCs after introducing CuPc as hole transfer layer. More importantly, our devices exhibit an outstanding durability and a promising thermal stability, making it rather meaningful in future fabrication and application of PSCs.


 

Keywords

Perovskite solar cells (PSCs); Metal halide; CsPbBr3; Cu-Phthalocyanine (CuPc); Carbon electrode

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