%0 Online Multimedia
%A Masi, Sofia
%A Echeverría-Arrondo, Carlos
%A Salim, K. M. Muhammed
%A Ngo, Thi Tuyen
%A Mendez, P. F.
%A López-Fraguas, Eduardo
%A Macias-Pinilla, David F.
%A Planelles, Josep
%A Climente, Juan I.
%A Mora-Seró, Iván
%D 2020
%T Chemi-Structural Stabilization of Formamidinium Lead
Iodide Perovskite by Using Embedded Quantum Dots
%U https://acs.figshare.com/articles/media/Chemi-Structural_Stabilization_of_Formamidinium_Lead_Iodide_Perovskite_by_Using_Embedded_Quantum_Dots/11604273
%R 10.1021/acsenergylett.9b02450.s002
%2 https://acs.figshare.com/ndownloader/files/21000321
%K phase
%K perovskite
%K V oc
%K PbS
%K efficiency
%K QD
%K FAPI
%K band gap
%X The approaches to
stabilize the perovskite structure of formamidinium
lead iodide (FAPI) commonly result in a blue shift of the band gap,
which limits the maximum photoconversion efficiency. Here, we report
the use of PbS colloidal quantum dots (QDs) as a stabilizing agent,
preserving the original low band gap of 1.5 eV. The surface chemistry
of PbS plays a pivotal role by developing strong bonds with the black
phase but weak ones with the yellow phase. As a result, a stable perovskite
FAPI black phase can be formed at temperatures as low as 85 °C
in just 10 min, setting a record of concomitantly fast and low-temperature
formation for FAPI, with important consequences for industrialization.
FAPI thin films obtained through this procedure reach an open-circuit
potential (Voc) of 1.105 V, 91% of the
maximum theoretical Voc, and preserve
the efficiency for more than 700 h. These findings reveal the potential
of strategies exploiting the chemi-structural properties of external
additives to relax the tolerance factor and optimize the optoelectronic
performance of perovskite materials.
%I ACS Publications