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Elucidating the Role of a Tetrafluoroborate‐Based Ionic Liquid at the n‐Type Oxide/Perovskite Interface
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-12-11 , DOI: 10.1002/aenm.201903231
Nakita K. Noel 1, 2 , Severin N. Habisreutinger 3 , Bernard Wenger 4 , Yen‐Hung Lin 4 , Fengyu Zhang 2 , Jay B. Patel 4 , Antoine Kahn 2 , Michael B. Johnston 4 , Henry J. Snaith 4
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-12-11 , DOI: 10.1002/aenm.201903231
Nakita K. Noel 1, 2 , Severin N. Habisreutinger 3 , Bernard Wenger 4 , Yen‐Hung Lin 4 , Fengyu Zhang 2 , Jay B. Patel 4 , Antoine Kahn 2 , Michael B. Johnston 4 , Henry J. Snaith 4
Affiliation
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Halide perovskites are currently one of the most heavily researched emerging photovoltaic materials. Despite achieving remarkable power conversion efficiencies, perovskite solar cells have not yet achieved their full potential, with the interfaces between the perovskite and the charge‐selective layers being where most recombination losses occur. In this study, a fluorinated ionic liquid (IL) is employed to modify the perovskite/SnO2 interface. Using Kelvin probe and photoelectron spectroscopy measurements, it is shown that depositing the perovskite onto an IL‐treated substrate results in the crystallization of a perovskite film which has a more n‐type character, evidenced by a decrease of the work function and a shift of the Fermi level toward the conduction band. Photoluminescence spectroscopy and time‐resolved microwave conductivity are used to investigate the optoelectronic properties of the perovskite grown on neat and IL‐modified surfaces and it is found that the modified substrate yields a perovskite film which exhibits an order of magnitude lower trap density than the control. When incorporated into solar cells, this interface modification results in a reduction in the current–voltage hysteresis and an improvement in device performance, with the best performing devices achieving steady‐state PCEs exceeding 20%.
中文翻译:
阐明基于四氟硼酸盐的离子液体在n型氧化物/钙钛矿界面上的作用
卤化物钙钛矿是目前研究最多的新兴光伏材料之一。尽管钙钛矿太阳能电池获得了非凡的功率转换效率,但钙钛矿太阳能电池尚未充分发挥其潜力,钙钛矿和电荷选择层之间的界面是复合损失最多的地方。在这项研究中,采用氟化离子液体(IL)修饰钙钛矿/ SnO 2界面。使用开尔文探针和光电子能谱测量,结果表明,将钙钛矿沉积在经过IL处理的基质上会导致钙钛矿膜的结晶,该钙钛矿膜具有更多的n型特征,这是由功函数的降低和硅原子的转移证明的。费米能级朝向导带 使用光致发光光谱法和时间分辨的微波电导率来研究在纯净和IL修饰的表面上生长的钙钛矿的光电性能,发现修饰的基质产生的钙钛矿膜的陷阱密度比对照低。 。结合到太阳能电池中后,这种接口修改可降低电流-电压迟滞并改善设备性能,
更新日期:2020-01-29
中文翻译:
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阐明基于四氟硼酸盐的离子液体在n型氧化物/钙钛矿界面上的作用
卤化物钙钛矿是目前研究最多的新兴光伏材料之一。尽管钙钛矿太阳能电池获得了非凡的功率转换效率,但钙钛矿太阳能电池尚未充分发挥其潜力,钙钛矿和电荷选择层之间的界面是复合损失最多的地方。在这项研究中,采用氟化离子液体(IL)修饰钙钛矿/ SnO 2界面。使用开尔文探针和光电子能谱测量,结果表明,将钙钛矿沉积在经过IL处理的基质上会导致钙钛矿膜的结晶,该钙钛矿膜具有更多的n型特征,这是由功函数的降低和硅原子的转移证明的。费米能级朝向导带 使用光致发光光谱法和时间分辨的微波电导率来研究在纯净和IL修饰的表面上生长的钙钛矿的光电性能,发现修饰的基质产生的钙钛矿膜的陷阱密度比对照低。 。结合到太阳能电池中后,这种接口修改可降低电流-电压迟滞并改善设备性能,