Recrystallized Perovskite Thin Film via Intense Pulse Light Sintering for Vertical Gradient Band Gap Perovskite Solar Cells
Journal
ACS Applied Energy Materials
Journal Volume
4
Journal Issue
12
Pages
14240-14248
Date Issued
2021
Author(s)
Abstract
A wet preparation process was developed to prepare vertical gradient perovskite film (MAPbBr3/MAPbBr3-xIx/MAPbI3) for solar cells. To avoid mutual dissolution, an MAPbBr3 quantum dot (QD) ink was directly inkjet printed on a spin-coated MAPbI3 film to create stacked perovskite layers (MAPbBr3 QD/MAPbI3). Intense pulse light (IPL) was used to sinter the stacked perovskite films. After the IPL sintering process, the grain size in the stacked layers significantly increased from 16 to 30 nm (MAPbBr3 QD) and from 123 to 538 nm (MAPbI3), respectively. Meanwhile, between the stacked layers, a mixed halide perovskite (MAPbBr3-xIx) film with a gradient was created. The IPL-sintered perovskite films remained stable without phase separation under 15 W/cm2 illimitation for 20 s. The gradient perovskite films were further assembled as an absorber layer in solar cell and exhibited a power conversion efficiency (PCE) of 17.06%. Moreover, the solar cell with vertical gradient showed good moisture stability and exhibited 80% PCE under relative humidity (RH) = 70% for 500 h. In summary, this process can create an interfacial gradient layer between light-absorbing materials and can be further applied to other material systems. ? 2021 American Chemical Society.
Subjects
gradient band gap
intense pulsed light
perovskite solar cell
phase separation
wet process
Energy gap
Film preparation
Perovskite
Phase separation
Semiconductor quantum dots
Sintering
Solar absorbers
Thin films
Gradient band gap
Intense pulsed light
Perovskite films
Perovskite thin films
Power conversion efficiencies
Preparation process
Pulse lights
Stacked layer
Vertical gradients
Wet process
Perovskite solar cells
SDGs
Type
journal article