摘要
Organic-inorganic hybrid perovskites, such as CH_3NH_3PbI_3(MAPbI_3), have recently captured intense research interest, for their promising optoelectronic applications with low cost and high performance.Two-step deposition is a common route to synthesize perovskite thin films, among which lead iodide(PbI_2) is first introduced using solution or vapor deposition methods, and subsequently transformed into the perovskite by reacting with CH_3NH_3I(MAI).Herein, we report a flash evaporation printing(FEP) technology is developed to prepare perovskite films, which employs a freestanding carbon nanotube(CNT) flash evaporator.Nanoporous PbI_2 thin films were directly printed on substrates as precursors by FEP, and then high-quality perovskite thin films were produced by in-situ reaction with MAI solution.The as-fabricated photovoltaic devices have a power conversion efficiency of 2.4% with a Voc of 0.89 V, a Jsc of 5.6 mA cm-2 and a FF of 48.2%.Modified TiO2 with PCBM interface layer, perovskite solar cells show better photovoltaic performance feature an efficiency of 10.3%, a Jsc of 15.9 mA cm-2 and a FF of 68.9%.The environmentally friendly and cost-effective FEP will prove itself a promising candidate for perovskite large-scale preparation.
Organic-inorganic hybrid perovskites, such as CH_3NH_3PbI_3(MAPbI_3), have recently captured intense research interest, for their promising optoelectronic applications with low cost and high performance.Two-step deposition is a common route to synthesize perovskite thin films, among which lead iodide(PbI_2) is first introduced using solution or vapor deposition methods, and subsequently transformed into the perovskite by reacting with CH_3NH_3I(MAI).Herein, we report a flash evaporation printing(FEP) technology is developed to prepare perovskite films, which employs a freestanding carbon nanotube(CNT) flash evaporator.Nanoporous PbI_2 thin films were directly printed on substrates as precursors by FEP, and then high-quality perovskite thin films were produced by in-situ reaction with MAI solution.The as-fabricated photovoltaic devices have a power conversion efficiency of 2.4% with a Voc of 0.89 V, a Jsc of 5.6 mA cm-2 and a FF of 48.2%.Modified TiO2 with PCBM interface layer, perovskite solar cells show better photovoltaic performance feature an efficiency of 10.3%, a Jsc of 15.9 mA cm-2 and a FF of 68.9%.The environmentally friendly and cost-effective FEP will prove itself a promising candidate for perovskite large-scale preparation.
引文
[1]Haoming Wei,Xingyue Zhao,Yang Wei*,Hong Lin*,Shoushan Fan,Kaili Jiang*,NPG Asia Materials,2017,In press.