Improved efficiency and air stability of two-dimensional p-i-n inverted perovskite solar cells by Cs doping
Journal
RSC Advances
Journal Volume
11
Journal Issue
33
Pages
20200-20206
Date Issued
2021
Author(s)
Abstract
Two-dimensional perovskite solar cells (2-D PSCs) have attracted much research attention in recent years because they are more stable in a regular environment than three-dimensional (3-D) ones are. In this study, we doped Cs into 2D perovskite (BA2(MA)2Pb3I10) films as the absorbing layers of the 2-D p-i-n inverted PSCs to investigate the influence of the Cs doping concentration on the properties of the 2-D perovskite films and the fabricated solar cells. Cs doping clearly improves the power conversion efficiency (PCE) and air stability of the PSCs. Doping perovskite with 10% Cs (the best doping concentration in this study) can increase the PSC efficiency from 7.98% to 10.11%. Scanning electron microscopy indicates the improved surface quality and crystallinity by Cs doping. However, excess Cs doping degrades the PCE of the PSCs. Furthermore, 10% Cs doped PSCs show air stability superior to that of undoped ones in unpackaged humidity environments. After exposure to 55% relative humidity (RH) in 19 °C air for 300 h, the PCE of the PSC decreased by only 39%, in contrast to 84% for the undoped PSC. ? The Royal Society of Chemistry 2021.
Subjects
Cesium
Conversion efficiency
Crystallinity
Efficiency
Perovskite
Scanning electron microscopy
Semiconductor doping
Absorbing layers
Air stability
Doping concentration
Perovskite films
Power conversion efficiencies
Threedimensional (3-d)
Perovskite solar cells
SDGs
Type
journal article