TY - JOUR
T1 - Tellurium-Based Double Perovskites A2TeX6 with Tunable Band Gap and Long Carrier Diffusion Length for Optoelectronic Applications
AU - Ju, Dianxing
AU - Zheng, Xiaopeng
AU - Yin, Jun
AU - Qiu, Zhiwen
AU - Turedi, Bekir
AU - Liu, Xiaolong
AU - Dang, Yangyang
AU - Cao, Bingqiang
AU - Mohammed, Omar F.
AU - Bakr, Osman
AU - Tao, Xutang
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the National Natural Science Foundation of China (Grant Nos. 51321091, 51772170, 51272129, and 51227002), National Key Research and Development Program of China (Grant No. 2016YFB1102201), the Program of Introducing Talents of Disciplines to Universities in China (111 Project 2.0 (Grant No. BP2018013), and King Abdullah University of Science and Technology (KAUST). We greatly thank Xiufeng Cheng and Zhaozhen Cao for their help in thermal properties and TRPL measurements, respectively.
PY - 2018/12/10
Y1 - 2018/12/10
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/630685
UR - https://pubs.acs.org/doi/10.1021/acsenergylett.8b02113
UR - http://www.scopus.com/inward/record.url?scp=85058802515&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.8b02113
DO - 10.1021/acsenergylett.8b02113
M3 - Article
SN - 2380-8195
VL - 4
SP - 228
EP - 234
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 1
ER -