当前位置：
X-MOL 学术
›
ACS Appl. Nano Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Stable Photodetectors Based on Formamidinium Lead Iodide Quantum Well Perovskite Nanoparticles Fabricated with Excess Organic Cations
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-07-15 , DOI: 10.1021/acsanm.1c01093 Mahdi Hasanzadeh Azar 1 , Maryam Mohammadi 1 , Nima Tabatabaei Rezaei 1 , Samaneh Aynehband 1 , Leyla Shooshtari 2 , Raheleh Mohammadpour 2 , Abdolreza Simchi 1, 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-07-15 , DOI: 10.1021/acsanm.1c01093 Mahdi Hasanzadeh Azar 1 , Maryam Mohammadi 1 , Nima Tabatabaei Rezaei 1 , Samaneh Aynehband 1 , Leyla Shooshtari 2 , Raheleh Mohammadpour 2 , Abdolreza Simchi 1, 2
Affiliation
|
Metal halide perovskite nanoparticles have recently attracted immense interest for photodetectors due to their outstanding optical and electronic properties such as high carrier diffusion length, tunable band gap (light absorption range), and high photoluminescence (PL) efficiency. Although significant progress has been achieved in the development of perovskites, their stability is yet to be addressed. To improve the stability and quantum efficiency of FAPbI3 perovskite nanocrystals, we present a room temperature protocol to fabricate fully passivated and stable FAPbI3 nanocrystals via 2D growth in the presence of amine ligands and an excess amount of the organic cations. The crystallization mechanism of 2D colloidal quantum wells (QWs) with long-time stability is ascribed to the excess amount of large organic cations which isolate the inorganic lattice octahedral layers. It is demonstrated that the QW films (130 nm) hold 90% of their PL intensity after 30 days, which is ∼8 times more stable than FAPbI3 quantum dot (QD) films. We also show the enhanced photoresponsivity of QW photodetectors (up to 100%) as compared with QD devices. The long-term ambient performance of perovskite QW photodetectors on account of their hydrophobicity is demonstrated. The findings can shed light on a way to develop ambient stable QW nanoparticle perovskite optoelectronic devices.
中文翻译：
基于甲脒碘化铅量子阱钙钛矿纳米粒子的稳定光电探测器，由过量有机阳离子制成
金属卤化物钙钛矿纳米粒子由于其出色的光学和电子特性，如高载流子扩散长度、可调带隙（光吸收范围）和高光致发光（PL）效率，最近引起了光电探测器的极大兴趣。尽管钙钛矿的开发取得了重大进展，但它们的稳定性仍有待解决。为了提高 FAPbI 3钙钛矿纳米晶体的稳定性和量子效率，我们提出了一种室温协议来制造完全钝化和稳定的 FAPbI 3在胺配体和过量有机阳离子的存在下通过二维生长获得纳米晶体。具有长期稳定性的二维胶体量子阱 (QW) 的结晶机制归因于过量的大有机阳离子，这些阳离子隔离了无机晶格八面体层。结果表明，QW 薄膜（130 nm）在 30 天后保持 90% 的 PL 强度，这比 FAPbI 3量子点（QD）薄膜稳定约 8 倍。我们还展示了 QW 光电探测器与 QD 器件相比增强的光响应性（高达 100%）。证明了钙钛矿 QW 光电探测器由于其疏水性而具有的长期环境性能。这些发现可以为开发环境稳定的 QW 纳米粒子钙钛矿光电器件提供线索。
更新日期：2021-08-27
中文翻译：
基于甲脒碘化铅量子阱钙钛矿纳米粒子的稳定光电探测器，由过量有机阳离子制成
金属卤化物钙钛矿纳米粒子由于其出色的光学和电子特性，如高载流子扩散长度、可调带隙（光吸收范围）和高光致发光（PL）效率，最近引起了光电探测器的极大兴趣。尽管钙钛矿的开发取得了重大进展，但它们的稳定性仍有待解决。为了提高 FAPbI 3钙钛矿纳米晶体的稳定性和量子效率，我们提出了一种室温协议来制造完全钝化和稳定的 FAPbI 3在胺配体和过量有机阳离子的存在下通过二维生长获得纳米晶体。具有长期稳定性的二维胶体量子阱 (QW) 的结晶机制归因于过量的大有机阳离子，这些阳离子隔离了无机晶格八面体层。结果表明，QW 薄膜（130 nm）在 30 天后保持 90% 的 PL 强度，这比 FAPbI 3量子点（QD）薄膜稳定约 8 倍。我们还展示了 QW 光电探测器与 QD 器件相比增强的光响应性（高达 100%）。证明了钙钛矿 QW 光电探测器由于其疏水性而具有的长期环境性能。这些发现可以为开发环境稳定的 QW 纳米粒子钙钛矿光电器件提供线索。
京公网安备 11010802027423号