Electroabsorption Spectroscopy Studies of (C4H9NH3)2PbI4 Organic–Inorganic Hybrid Perovskite Multiple Quantum Wells,The Journal of Physical Chemistry Letters

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Electroabsorption Spectroscopy Studies of (C4H9NH3)2PbI4 Organic–Inorganic Hybrid Perovskite Multiple Quantum Wells
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acs.jpclett.7b01741
Eric Amerling ₁ , Sangita Baniya ₁ , Evan Lafalce ₁ , Chuang Zhang ₁ , Zeev Valy Vardeny ₁ , Luisa Whittaker-Brooks ₁

Affiliation

Two-dimensional (2D) organic–inorganic hybrid perovskite multiple quantum wells that consist of multilayers of alternate organic and inorganic layers exhibit large exciton binding energies of order of 0.3 eV due to the dielectric confinement between the inorganic and organic layers. We have investigated the exciton characteristics of 2D butylammonium lead iodide, (C₄H₉NH₃)₂PbI₄ using photoluminescence and UV–vis absorption in the temperature range of 10 K to 300 K, and electroabsorption spectroscopy. The evolution of an additional absorption/emission at low temperature indicates that this compound undergoes a phase transition at ≈250 K. We found that the electroabsorption spectrum of each structural phase contains contributions from both quantum confined exciton Stark effect and Franz–Keldysh oscillation of the continuum band, from which we could determine more accurately the 1s exciton, continuum band edge, and the exciton binding energy.

中文翻译：

（C ₄ H ₉ NH ₃）₂ PbI ₄有机-无机杂化钙钛矿多量子阱的电吸收光谱研究

由无机和有机层之间的介电限制，由交替的有机层和无机层组成的二维（2D）有机-无机杂化钙钛矿多量子阱表现出0.3 eV量级的大激子结合能。我们研究了2D丁基碘化铵碘化铅（C ₄ H ₉ NH ₃）₂ PbI ₄的激子特性在10 K至300 K的温度范围内使用光致发光和UV-vis吸收，以及电吸收光谱法。低温下其他吸收/发射的演化表明该化合物在≈250K时经历了相变。我们发现，每个结构相的电吸收谱都包含量子约束激子Stark效应和Franz-Keldysh振荡的贡献。连续带，从中我们可以更准确地确定1s激子，连续带边缘和激子结合能。

更新日期：2017-09-11

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