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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Charge transfer and recombination at the metal oxide/CH3NH3PbCll2/spiro-OMeTAD interfaces: uncovering the detailed mechanism behind high efficiency solar cells
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Charge transfer and recombination at the metal oxide/CH3NH3PbCll2/spiro-OMeTAD interfaces: uncovering the detailed mechanism behind high efficiency solar cells

机译：金属氧化物/ CH3NH3PbCll2 / spiro-OMeTAD界面上的电荷转移和复合：揭示高效太阳能电池背后的详细机理

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摘要

In recent years, organometal haiide perovskite-based solid-state hybrid solar cells have attracted unexpected increasing interest because of their high efficiency (the record power conversion efficiency has been reported to be over 15%) and low fabrication cost. It has been accepted that the high efficiency was mainly attributed to the strong optical absorption (absorption coefficient: 15 000 cm~(-1) at 550 nm) over a broader range (up to 800 nm) and the long lifetimes of photoexcited charge carriers (in the order of 10 ns-a few 100 ns) of the perovskite absorbers. However, much of the fundamental . photophysical properties of perovskite relating to the high photovoltaic performance are remained to be investigated. The charge separation and recombination processes at the material interfaces are particularly important for solar cell performances. To better understand the high efficiency of perovskite solar cells, we systematically investigated the charge separation (electron and hole injection) and charge recombination dynamics of CH3NH3PbCll2 hybrid solar cells employing TiO2 nanostructures as the electron transfer material (ETM) and sp/'ro-OMeTAD as the hole transfer material (HTM). The measurements were carried out using transient absorption (TA) techniques on a time scale from sub-picoseconds to milliseconds. We clarified the timescales of electron injection, hole injection, and recombination processes in TiCVCH3N3PbCll2/sp/ro-OMeTAD solar cells. Charge separation and collection efficiency of the perovskite-based solar cells were discussed. In addition, the effect of TiO2 size on the charge separation and recombination dynamics was also investigated. It was found that all TiO2-based perovskite solar cells possessed similar charge separation processes, but quite different recombination dynamics. Our results indicate that charge recombination was crucial to the performance of the perovskite solar cells, which could be effectively suppressed through optimising nanostructured TiO2 films and surface passivation, thus pushing these cells to even higher efficiency.
机译：近年来，基于有机金属氢化物钙钛矿的固态混合太阳能电池因其高效率（据报道功率转换效率已超过15％）和较低的制造成本而引起了人们意想不到的兴趣。公认的是，高效率主要归因于在更宽的范围内（高达800 nm）的强光吸收（在550 nm处的吸收系数：15000 cm〜（-1））和光激发电荷载流子的长寿命（大约10 ns-几百ns的数量级）钙钛矿吸收剂。但是，很多根本。钙钛矿与高光伏性能有关的光物理性质仍有待研究。材料界面处的电荷分离和复合过程对于太阳能电池的性能特别重要。为了更好地了解钙钛矿太阳能电池的高效率，我们系统地研究了以TiO2纳米结构作为电子传输材料（ETM）和sp /'ro-OMeTAD的CH3NH3PbCll2杂化太阳能电池的电荷分离（电子和空穴注入）和电荷重组动力学作为空穴传输材料（HTM）。使用瞬态吸收（TA）技术在亚皮秒到毫秒的时间范围内进行测量。我们阐明了TiCVCH3N3PbCll2 / sp / ro-OMeTAD太阳能电池中电子注入，空穴注入和重组过程的时间尺度。讨论了钙钛矿基太阳能电池的电荷分离和收集效率。此外，还研究了TiO2尺寸对电荷分离和重组动力学的影响。发现所有基于TiO 2的钙钛矿太阳能电池都具有相似的电荷分离过程，但是具有完全不同的复合动力学。我们的结果表明，电荷复合对于钙钛矿太阳能电池的性能至关重要，可以通过优化纳米结构的TiO2薄膜和表面钝化来有效地抑制这种复合，从而将这些电池推向更高的效率。

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