Despite the excellent optoelectronic properties, organic-inorganic hybrid perovskite solar cells (PSCs) still present significant challenges in terms of ambient stability. CsPbI Br, a member of all-inorganic perovskites, may respond to this challenge because of its inherent high stability against light, moisture, and heat, and therefore has gained tremendous attraction recently. However, the practical application of CsPbI Br is still impeded by the notorious phenomenon of photoinduced halide segregation. Herein, by applying first-principles calculations, the stability, electronic structure, defect properties, and ion-diffusion properties of the stoichiometric CsPbI Br (110) surface and that with the adsorption of KX (X = Cl, Br, I) are systematically investigated. It is found that the adsorbed KX can serve as an external substitute of the halogen vacancies on the surface, therefore inhibiting halogen segregation and improving the stability of the CsPbI Br surface. The KX can also eliminate deep-level defect states caused by antisites, thereby contributing to the promoted optoelectronic properties of CsPbI Br. The mechanistic understanding of surface passivation in this work can lay the foundation for the future design of CsPbI Br PSCs with optimized optoelectronic performance.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/smll.202202623 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Highly Efficient and Stable CsPbI Perovskite Quantum Dots Light-Emitting Diodes Through Synergistic Effect of Halide-Rich Modulation and Lattice Repair.
Small
January 2025
College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, P. R. China.
Currently, CsPbI quantum dots (QDs) based light-emitting diodes (LEDs) are not well suited for achieving high efficiency and operational stability due to the binary-precursor method and purification process, which often results in the nonstoichiometric ratio of Cs/Pb/I. This imbalance leads to amounts of iodine vacancies, inducing severe non-radiative recombination processes and phase transitions of QDs. Herein, red-emitting CsPbI QDs are reported with excellent optoelectronic properties and stability based on the synergistic effects of halide-rich modulation passivation and lattice repair.
View Article and Find Full Text PDFAcidic Engineering on Buried Interface toward Efficient Inorganic CsPbI Perovskite Light-Emitting Diodes.
Nano Lett
January 2025
School of Environmental Science and Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China.
Inorganic CsPbI perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable CsPbI crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads to insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles in commercialization progress. Herein, we demonstrate an effective acidic engineering strategy with wide applicability to modify the surface property of ZnO and regulate CsPbI crystallization.
View Article and Find Full Text PDFComprehensive Passivation of Surface and Bulk Defects in Perovskite for High Efficiency Carbon-Based CsPbI Solar Cells.
Angew Chem Int Ed Engl
January 2025
Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, No. 483 Wushan Road, Guangzhou, 510642, China.
Carbon-based perovskite solar cells (C-PSCs) have the advantages of high stability and low cost, but their mean efficiency has become an obstacle to commercialization. Defects, which are widely distributed on the surface and bulk of films, are an important factor in C-PSCs for low efficiency. The conventional post-treatment method through forming a low-dimensional (LD) perovskite layer usually fails in manipulating the bulk defects.
View Article and Find Full Text PDFPost-Degradation Recovery of CsPbI Quantum Dot Solar Cells.
Small
January 2025
Chair for Emerging Electronic Technologies, TUD Dresden University of Technology, Nöthnitzer Straße 61, 01187, Dresden, Germany.
The stability of perovskite quantum dot solar cells is one of the key challenges of this technology. This study reveals the unique degradation behavior of cesium lead triiodide (CsPbI) quantum dot solar cells. For the first time, it is shown that the oxygen-induced degradation and performance loss of CsPbI quantum dot photovoltaic devices can be reversed by exposing the degraded samples to humidity, allowing the performance to recover and even surpass the initial performance.
View Article and Find Full Text PDFOvercoming optical losses in thin metal-based recombination layers for efficient n-i-p perovskite-organic tandem solar cells.
Nat Commun
January 2025
Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
Perovskite-organic tandem solar cells (P-O-TSCs) hold substantial potential to surpass the theoretical efficiency limits of single-junction solar cells. However, their performance is hampered by non-ideal interconnection layers (ICLs). Especially in n-i-p configurations, the incorporation of metal nanoparticles negatively introduces serious parasitic absorption, which alleviates photon utilization in organic rear cell and decisively constrains the maximum photocurrent matching with front cell.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!