Investors Hangout Stock Message Boards Logo
  • Home
  • Mailbox
  • Boards
  • Favorites
  • Whats Hot!
  • Login - Join Now!
Quantum Materials Corp. QTMM
(Total Views: 323)
Posted On: 02/15/2017 12:39:58 PM
Post# of 22465
Posted By: dockzef
Sensing the role of graphene-based electron transport layer in perovskite solar cells by photoluminescence spectroscopy

F. Biccari, F. Gabelloni, E. Burzi, M. Gurioli, S. Pescetelli, A. Agresti, A. Di Carlo, F. Bonaccorso, E. Kymakis, A. Vinattieri
(Submitted on 14 Feb 2017)

The electron transport layer (ETL) plays a fundamental role in perovskite solar cells. Recently, graphene-based ETLs have been proved to be good candidate for scalable fabrication processes and to achieve higher carrier injection with respect to most commonly used ETLs. In this work we experimentally study the effects of different graphene-based ETLs in sensitized MAPI solar cells. By means of time-integrated and picosecond time-resolved photoluminescence techniques, the carrier recombination dynamics in MAPI films embedded in different ETLs is investigated. Using graphene doped mesoporous TiO2 (G+mTiO2) with the addition of a lithium-neutralized graphene oxide (GO-Li) interlayer as ETL , we find that the carrier collection efficiency is increased by about a factor two with respect to standard mTiO2. Taking advantage of the absorption coefficient dispersion, we probe the MAPI layer morphology, along the thickness, finding that the MAPI embedded in the ETL composed by G+mTiO2 plus GO-Li brings to a very good crystalline quality of the MAPI layer with a trap density about one order of magnitude lower than that found with the other ETLs. In addition, this ETL freezes MAPI at the tetragonal phase, regardless of the temperature. Graphene-based ETLs can open the way to significant improvement of perovskite solar cells.

https://arxiv.org/abs/1702.04159













(0)
(0)









  • New Post - Investors HangoutNew Post

  • Public Reply - Investors HangoutPublic Reply

  • Private Reply - Investors HangoutPrivate Reply

  • Board - Investors HangoutBoard

  • More - Investors HangoutMore

  • Keep Post - Investors HangoutKeep Post
  • Report Post - Investors HangoutReport Post
  • Home - Investors HangoutHome
  • Mailbox - Investors HangoutMailbox
  • Boards - Investors HangoutBoards
  • Favorites - Investors HangoutFavorites
  • Whats Hot! - Investors HangoutWhats Hot!
  • Settings - Investors HangoutSettings
  • Login - Investors HangoutLogin
  • Live Site - Investors HangoutLive Site