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Tellurium-Based Double Perovskites A2TeX6 with Tunable Band Gap and Long Carrier Diffusion Length for Optoelectronic Applications
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-12-10 00:00:00 , DOI: 10.1021/acsenergylett.8b02113 Dianxing Ju 1 , Xiaopeng Zheng 2, 3 , Jun Yin 3 , Zhiwen Qiu 4 , Bekir Türedi 2, 3 , Xiaolong Liu 1 , Yangyang Dang 1 , Bingqiang Cao 4, 5 , Omar F. Mohammed 3 , Osman M. Bakr 2, 3 , Xutang Tao 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-12-10 00:00:00 , DOI: 10.1021/acsenergylett.8b02113 Dianxing Ju 1 , Xiaopeng Zheng 2, 3 , Jun Yin 3 , Zhiwen Qiu 4 , Bekir Türedi 2, 3 , Xiaolong Liu 1 , Yangyang Dang 1 , Bingqiang Cao 4, 5 , Omar F. Mohammed 3 , Osman M. Bakr 2, 3 , Xutang Tao 1
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Lead-free hybrid perovskites have attracted immense interest as environmentally friendly light absorbers. Here, we report on tellurium (Te)-based double perovskites A2TeX6 (A = MA, FA, or BA; X = Br– or I–; MA = CH3NH3; FA = CH(NH2)2; BA = benzylamine) as potentially active materials for optoelectronic devices. These perovskites exhibit a tunable band gap (1.42–2.02 eV), a low trap density (∼1010 cm–3), and a high mobility (∼65 cm2 V–1 s–1). Encouragingly, the MA2TeBr6 single crystal with a band gap of 2.00 eV possesses a long carrier lifetime of ∼6 μs and corresponding carrier diffusion lengths of ∼38 μm, which are ideal characteristics for a material for photodetectors and tandem solar cells. Moreover, A2TeX6 perovskites are relatively robust in ambient conditions, being stable for at least two months without showing any signs of phase change. Our findings bring to the forefront a family of lead-free Te-based perovskites for nontoxic perovskite optoelectronics.
中文翻译：
碲基双钙钛矿A 2 TeX 6，带隙可调，载流子扩散长度长，适用于光电应用
无铅混合钙钛矿作为环保型光吸收剂引起了极大的兴趣。在此，我们报告基于碲（Te）的双钙钛矿A 2 TeX 6（A = MA，FA或BA； X = Br –或I –； MA = CH 3 NH 3； FA = CH（NH 2）2 ; BA =苄胺）作为光电器件的潜在活性材料。这些钙钛矿具有可调节的带隙（1.42-2.02 eV），低陷阱密度（〜10 10 cm –3）和高迁移率（〜65 cm 2 V –1 s –1）。令人鼓舞的是，MA 2 TeBr带隙为2.00 eV的6个单晶具有约6μs的长载流子寿命和对应的约38μm的载流子扩散长度，是光电探测器和串联太阳能电池材料的理想特性。此外，A 2 TeX 6钙钛矿在环境条件下相对坚固，至少可稳定两个月，没有任何相变迹象。我们的发现将用于无毒钙钛矿光电的无铅Te基钙钛矿家族推到了最前沿。
更新日期：2018-12-10
中文翻译：
碲基双钙钛矿A 2 TeX 6，带隙可调，载流子扩散长度长，适用于光电应用
无铅混合钙钛矿作为环保型光吸收剂引起了极大的兴趣。在此，我们报告基于碲（Te）的双钙钛矿A 2 TeX 6（A = MA，FA或BA； X = Br –或I –； MA = CH 3 NH 3； FA = CH（NH 2）2 ; BA =苄胺）作为光电器件的潜在活性材料。这些钙钛矿具有可调节的带隙（1.42-2.02 eV），低陷阱密度（〜10 10 cm –3）和高迁移率（〜65 cm 2 V –1 s –1）。令人鼓舞的是，MA 2 TeBr带隙为2.00 eV的6个单晶具有约6μs的长载流子寿命和对应的约38μm的载流子扩散长度，是光电探测器和串联太阳能电池材料的理想特性。此外，A 2 TeX 6钙钛矿在环境条件下相对坚固，至少可稳定两个月，没有任何相变迹象。我们的发现将用于无毒钙钛矿光电的无铅Te基钙钛矿家族推到了最前沿。
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