Asset Details
Do you wish to reserve the book?
Spatially segregated free-carrier and exciton populations in individual lead halide perovskite grains
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Spatially segregated free-carrier and exciton populations in individual lead halide perovskite grains
Do you wish to request the book?
Spatially segregated free-carrier and exciton populations in individual lead halide perovskite grains
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Spatially segregated free-carrier and exciton populations in individual lead halide perovskite grains
2017
Overview
A study of single grains of lead halide perovskite reveals the presence of both excitons and free charge carriers.
The nature of charge carriers in methylammonium lead iodide perovskites (MAPbI
3
) at room temperature is still a matter of considerable debate
1
,
2
,
3
. Here, we demonstrate that within single grains of MAPbI
3
, strong spatial heterogeneities on the nanometre length scale are present and associated with simultaneous free-carrier and exciton populations. These heterogeneous populations, hidden in ensemble measurements, have a signature of spatially resolved relaxation dynamics for above-bandgap photoexcitation. Using spectrally resolved transient absorption microscopy, we directly observe both red- and blueshifts of the band-edge absorption across individual grains due to a dynamic Stark shift and screening of excitonic transitions by hot carriers. These observations help address a long-standing debate on the identity of the charge carriers, showing that both excitons and free carriers coexist, but are spatially segregated on the length scale of hundreds of nanometres.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
Seems like something went wrong :( Kindly try again later!