Impact of self-assembled monolayer structural design on perovskite phase regulation, hole-selective contact, and energy loss in inverted perovskite solar cells
Journal
Nano Energy
Journal Volume
132
Start Page
110405
ISSN
2211-2855
Date Issued
2024-12-15
Author(s)
Ming-Hsuan Yu
Xingyu Liu
Hao-Wei Yu
Shih-Feng Kao
Chiung-Han Chen
Yu-Cheng Tseng
I.-Chih Ni
Bi-Hsuan Lin
Yang Wang
DOI
10.1016/j.nanoen.2024.110405
Abstract
Recent studies have shown that self-assembled molecule (SAM)-based hole-selective contacts (HSCs) offer a promising solution to the challenges faced by perovskite solar cells (PVSCs), including minimal material consumption, scalable production, high interface stability, and the use of environmentally friendly solvents. In this study, the efficacy of two designs of SAMs (Cz and PA) as HSCs in inverted PVSCs was investigated by comparing them with the conventional MeO-2PACz (MeO) SAM. Surface analyses showed that the surface of PA is smoother than that of Cz, which helps to reduce interfacial defects. Subsequent perovskite deposition exhibited a reduced formation of the PbI2 phase, incidiating that its phase modulation ability is superior to that of MeO. Further analyses demonstrate the superior charge extraction ability of PA as a result of reduced interfacial defects and non-radiative recombination at the HSC/perovskite interface. By further coupling with phenethylammonium iodide (PEAI) surface passivation, both interfaces of the perovskite film were optimized and the inverted ((FAPbI3)0.85(MAPbBr3)0.15)0.95(CsPbI3)0.05 (bandgap = 1.62 eV) PVSC achieves a high power conversion efficiency (PCE) of 23.3 % and a very high open-circuit voltage of 1.227 V due to the largely reduced energy loss. In addition, the PA PVSC exhibits enhanced long-term thermal stability at 85°C in a nitrogen atmosphere.
Subjects
Hole-selective contacts
Inverted perovskite solar cells
Mixed-cation perovskite
Self-assembled materials
Surface passivation
SDGs
Publisher
Elsevier BV
Type
journal article