Replies to post #85246 on Quantum Materials Corp. (fka QTMM)

[puravida19]

LOL There was a new Perovskite record in Japan last month. Do your own DD if you
don't believe others.

I don't agree with Dockzef on much but he knows his quantum science from all the papers he has read.

[dockzef]

For starters:

Getting high with quantum dot solar cells

Joel Jean
Nature Energy (2020)Cite this articl



Colloidal perovskite quantum dots offer potential stability advantages for solar cells over bulk perovskites but lag far behind in device efficiency. Now, a modified cation exchange method has been shown to improve the optoelectronic quality of perovskite nanocrystals, improving further the efficiency and stability of quantum dot solar cells.

https://www.nature.com/articles/s41560-019-0534-8

This one is from Ted Sergants crew in Toronto....

https://investorshub.advfn.com/boards/read_msg.aspx?message_id=153458639

[dockzef]

MoS2 Quantum Dot/Graphene Hybrids for Advanced Interface Engineering of CH3NH3PbI3 Perovskite Solar Cell with Efficiency over 20%

Leyla Najafi, Babak Taheri, Beatriz Martin-Garcia, Sebastiano Bellani, Diego Di Girolamo, Antonio Agresti, Reinier Oropesa-Nunez, Sara Pescetelli, Luigi Vesce, Emanuele Calabro, Mirko Prato, Antonio E. Del Rio Castillo, Aldo Di Carlo, Francesco Bonaccorso
(Submitted on 21 Mar 2019)

Interface engineering of organic-inorganic halide perovskite solar cells (PSCs) plays a pivotal role in achieving high power conversion efficiency (PCE). Graphene and related two-dimensional materials (GRMs) are promising candidates to tune on demand the interface properties of PSCs. In this work, we fully exploit the potential of GRMs by controlling the optoelectronic properties of hybrids between molybdenum disulfide (MoS2) and reduced graphene oxide (RGO) as hole transport layer (HTL) and active buffer layer (ABL) in mesoscopic methylammonium lead iodide (CH3NH3PbI3) perovskite (MAPbI3)-based PSC. We show that zero-dimensional MoS2 quantum dots (MoS2 QDs), derived by liquid phase exfoliated MoS2 flakes, provide both hole-extraction and electron-blocking properties. In fact, on the one hand, intrinsic n-type doping-induced intra-band gap states effectively extract the holes through an electron injection mechanism. On the other hand, quantum confinement effects increase the optical band gap of MoS2 (from 1.4 eV for the flakes to > 3.2 for QDs), raising the minimum energy of its conduction band (from -4.3 eV for the flakes to -2.2 eV for QDs) above the one of conduction band of MAPbI3 (between -3.7 and -4 eV) and hindering electron collection. The van der Waals hybridization of MoS2 QDs with functionalized reduced graphene oxide (f-RGO), obtained by chemical silanization-induced linkage between RGO and (3-mercaptopropyl)trimethoxysilane, is effective to homogenize the deposition of HTLs or ABLs onto the perovskite film, since the two-dimensional (2D) nature of RGO effectively plug the pinholes of the MoS2 QDs films. Our graphene interface engineering (GIE) strategy based on van der Waals MoS2 QD/graphene hybrids enable MAPbI3-based PSCs to achieve PCE up to 20.12% (average PCE of 18.8%).

https://arxiv.org/abs/1903.08954