Two-Photon Absorption in Organometallic Bromide Perovskites

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• 作者：Grant Walters ; Brandon R. Sutherland ; Sjoerd Hoogland ; Dong Shi ; Riccardo Comin ; Daniel P. Sellan ; Osman M. Bakr ; Edward. H. Sargent
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：9
• 期：9
• 页码：9340-9346
• 全文大小：431K
• ISSN：1936-086X

文摘

Organometallic trihalide perovskites are solution-processed semiconductors that have made great strides in third-generation thin film light-harvesting and light-emitting optoelectronic devices. Recently, it has been demonstrated that large, high-purity single crystals of these perovskites can be synthesized from the solution phase. These crystals鈥?large dimensions, clean bandgap, and solid-state order have provided us with a suitable medium to observe and quantify two-photon absorption in perovskites. When CH₃NH₃PbBr₃ single crystals are pumped with intense 800 nm light, we observe band-to-band photoluminescence at 572 nm, indicative of two-photon absorption. We report the nonlinear absorption coefficient of CH₃NH₃PbBr₃ perovskites to be 8.6 cm GW^鈥? at 800 nm, comparable to epitaxial single-crystal semiconductors of similar bandgap. We have leveraged this nonlinear process to electrically autocorrelate a 100 fs pulsed laser using a two-photon perovskite photodetector. This work demonstrates the viability of organometallic trihalide perovskites as a convenient and low-cost nonlinear absorber for applications in ultrafast photonics.