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Iodomethane-Mediated Organometal Halide Perovskite with Record Photoluminescence Lifetime
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2016-08-25 00:00:00 , DOI: 10.1021/acsami.6b05770 Weidong Xu 1 , John A. McLeod 1 , Yingguo Yang 2 , Yimeng Wang 3 , Zhongwei Wu 1 , Sai Bai 4 , Zhongcheng Yuan 4 , Tao Song 1 , Yusheng Wang 1 , Junjie Si 5 , Rongbin Wang 1 , Xingyu Gao 2 , Xinping Zhang 3 , Lijia Liu 1 , Baoquan Sun 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2016-08-25 00:00:00 , DOI: 10.1021/acsami.6b05770 Weidong Xu 1 , John A. McLeod 1 , Yingguo Yang 2 , Yimeng Wang 3 , Zhongwei Wu 1 , Sai Bai 4 , Zhongcheng Yuan 4 , Tao Song 1 , Yusheng Wang 1 , Junjie Si 5 , Rongbin Wang 1 , Xingyu Gao 2 , Xinping Zhang 3 , Lijia Liu 1 , Baoquan Sun 1
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Organometallic lead halide perovskites are excellent light harvesters for high-efficiency photovoltaic devices. However, as the key component in these devices, a perovskite thin film with good morphology and minimal trap states is still difficult to obtain. Herein we show that by incorporating a low boiling point alkyl halide such as iodomethane (CH3I) into the precursor solution, a perovskite (CH3NH3PbI3–xClx) film with improved grain size and orientation can be easily achieved. More importantly, these films exhibit a significantly reduced amount of trap states. Record photoluminescence lifetimes of more than 4 μs are achieved; these lifetimes are significantly longer than that of pristine CH3NH3PbI3–xClx films. Planar heterojunction solar cells incorporating these CH3I-mediated perovskites have demonstrated a dramatically increased power conversion efficiency compared to the ones using pristine CH3NH3PbI3–xClx. Photoluminescence, transient absorption, and microwave detected photoconductivity measurements all provide consistent evidence that CH3I addition increases the number of excitons generated and their diffusion length, both of which assist efficient carrier transport in the photovoltaic device. The simple incorporation of alkyl halide to enhance perovskite surface passivation introduces an important direction for future progress on high efficiency perovskite optoelectronic devices.
中文翻译：
碘甲烷介导的有机金属卤化物钙钛矿具有创纪录的光致发光寿命
有机金属卤化铅钙钛矿是用于高效光伏设备的出色光收集器。然而，作为这些装置中的关键部件，仍然难以获得具有良好形态和最小陷阱态的钙钛矿薄膜。本文中，我们表明，通过将低沸点卤代烷（例如碘甲烷（CH 3 I））掺入前体溶液中，可以轻松获得具有改善的晶粒尺寸和方向的钙钛矿（CH 3 NH 3 PbI 3– x Cl x）膜。 。更重要的是，这些膜表现出明显减少的陷阱态量。记录的光致发光寿命达到4μs以上；这些寿命比原始CH的寿命长得多3 NH 3 PbI 3 – x Cl x膜。与使用原始CH 3 NH 3 PbI 3– x Cl x的平面异质结太阳能电池相比，结合了这些CH 3 I介导的钙钛矿的平面异质结太阳能电池已显示出显着提高的功率转换效率。光致发光，瞬态吸收和微波检测到的电导率测量结果均提供了一致的证据，证明CH 3另外，增加了产生的激子的数量及其扩散长度，这两者都有助于光伏器件中有效的载流子传输。简单地掺入卤代烷以增强钙钛矿表面钝化，为高效钙钛矿光电器件的未来发展提供了重要的方向。
更新日期：2016-08-25
中文翻译：
碘甲烷介导的有机金属卤化物钙钛矿具有创纪录的光致发光寿命
有机金属卤化铅钙钛矿是用于高效光伏设备的出色光收集器。然而，作为这些装置中的关键部件，仍然难以获得具有良好形态和最小陷阱态的钙钛矿薄膜。本文中，我们表明，通过将低沸点卤代烷（例如碘甲烷（CH 3 I））掺入前体溶液中，可以轻松获得具有改善的晶粒尺寸和方向的钙钛矿（CH 3 NH 3 PbI 3– x Cl x）膜。 。更重要的是，这些膜表现出明显减少的陷阱态量。记录的光致发光寿命达到4μs以上；这些寿命比原始CH的寿命长得多3 NH 3 PbI 3 – x Cl x膜。与使用原始CH 3 NH 3 PbI 3– x Cl x的平面异质结太阳能电池相比，结合了这些CH 3 I介导的钙钛矿的平面异质结太阳能电池已显示出显着提高的功率转换效率。光致发光，瞬态吸收和微波检测到的电导率测量结果均提供了一致的证据，证明CH 3另外，增加了产生的激子的数量及其扩散长度，这两者都有助于光伏器件中有效的载流子传输。简单地掺入卤代烷以增强钙钛矿表面钝化，为高效钙钛矿光电器件的未来发展提供了重要的方向。
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