Abstract
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.
Highlights
Organic–inorganic perovskite solar cells (PSCs) are appearing as a hopeful new generation of photovoltaic technology and have revolutionized the prospects of emerging photovoltaic industry, because of the tremendous increase in device performance [1,2,3,4,5,6]
Our results suggest that introducing CuPc between the perovskite layer and carbon electrode provides a simple and effective route to facilitate charge transfer and suppress charge recombination in PSCs
The cell consists of functional layers of fluorine-doped tin oxide (FTO)/compact TiO2/mesoporous TiO2/inorganic perovskite CsPbBr3/CuPc/carbon
Summary
Organic–inorganic perovskite solar cells (PSCs) are appearing as a hopeful new generation of photovoltaic technology and have revolutionized the prospects of emerging photovoltaic industry, because of the tremendous increase in device performance [1,2,3,4,5,6]. P-type semiconductor CuPc, small molecular HTMs with planar configuration, is preferable in fabricating stable and efficient traditional organic PSCs [37,38,39] It owns properties of low cost, ease of synthesis, low band gap, high hole mobility of 10-3–10-2 cm V-1 S-1 (as compared with 4 9 10-5 cm V-1 S-1 for spiro-OMeTAD) [40], good stability (starting degradation above 500 °C in air), and long exciton diffusion length (Lex ranging from 8 to 68 nm) [41,42,43]. Our devices exhibit an outstanding durability and a promising thermal stability, compared with the HTM-free CsPbBr3 devices and traditional MAPbI3 devices
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