Details

Autor(en) / Beteiligte

• Zhang, Yun-Fang
• Tang, Shu-Yu
• Xu, Yu-Qiu
• Li, Meng-Zhen
• Cheng, Shu-Ping
• Ai, Yong

Titel

Halogen substitution assisted modification on phase transition point and band gap of (DBU) PbX3 (X = Cl, Br, I)

Ist Teil von

• Journal of solid state chemistry, 2022-08, Vol.312, p.123198, Article 123198

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Lead halide hybrid perovskite with typical formula ABX3 has great application prospects in the field of optoelectronic devices due to their excellent characteristics, including easy processing, adjustable structure, tunable band gaps. In this work, we report three halogen-substituted lead halide hybrid perovskites, namely, (DBU) PbX3 (DBU ​= ​1,8-diazabicyclo [5.4.0] undec-7-ene, X ​= ​Cl, Br, I). These hybrid compounds have similar one-dimensional chain perovskite structures and undergo above-room temperature solid to solid phase transition. The variation of the heavy halogen atoms from Cl, Br to I on the X site causes a gradually larger octahedral space, which contributes to the decrease in phase transition temperature, because of the confinement effect. Meanwhile, a reduction in the band gap occurs for (DBU) PbX3 was obtained. This work highlights the halogen substitution on the lead halide hybrid perovskite towards excellent performance, which will benefit the field of optoelectronics. With the substitution of the heavy halogen atoms at the X site, the phase transition point and the band gap of the one-dimensional chain perovskite (DBU) PbX3 are reduced. [Display omitted] •Three 1D lead halide hybrid perovskites were synthesized by halogen substitution.•The phase transition temperature of (DBU) PbX3 have a decrease trend from X ​= ​Cl, Br to X ​= ​I.•The band gap of (DBU) PbX3 have a decrease tendency from X ​= ​Cl, Br to X ​= ​I.