scholarly journals Impact of Delay Time before Annealing MAI-PbI2-DMSO Intermediate Phase on Perovskite Film Quality and Photo-Physical Properties

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 151 ◽  
Author(s):  
Yujun Yao ◽  
Xiaoping Zou ◽  
Jin Cheng ◽  
Dan Chen ◽  
Chuangchuang Chang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Physical Properties ◽  
Delay Time ◽  
High Performance ◽  
Intermediate Phase ◽  
Perovskite Solar Cells ◽  
Device Performance ◽  
Perovskite Layer ◽  
The Impact

High-performance perovskite solar cells are strongly dependent on the quality of the perovskite layer. Two-step sequential deposition of CH3NH3PbI3 (MAPbI3) films is widely used to fabricate perovskite solar cells and many factors influence the quality of perovskite films, such as the delay time before annealing the MAI-PbI2-DMSO intermediate phase, which would impact the morphology and photo-physical properties of perovskite thin films. Here, the experimental research indicates that the impact of the delay time before annealing the MAI-PbI2-DMSO intermediate phase on the quality, crystallinity, and photo-physical properties of perovskite film is crucial. During the delay process, the delay time before annealing the MAI-PbI2-DMSO intermediate phase plays an important role in the nucleation process of perovskite grains inside the intermediate phase. With the extension of the delay time before annealing, the quality of the perovskite film deteriorates, thus the photo-physical properties change. We found that after the localized liquid–liquid diffusion of MAI and PbI2, with the extension of the delay time before annealing the MAI-PbI2-DMSO intermediate phase, the nucleation number of the perovskite grains increases and the grain size becomes smaller. Therefore, with the extension of the delay time before annealing, the device performance deteriorates.

The introduction of a perovskite seed layer for high performance perovskite solar cells

2018 ◽  
Vol 6 (41) ◽  
pp. 20138-20144 ◽  
Author(s):  
Jaeki Jeong ◽  
Hak-Beom Kim ◽  
Yung Jin Yoon ◽  
Na Gyeong An ◽  
Seyeong Song ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Device Performance ◽  
Pure Crystal ◽  
Perovskite Layer ◽  
Perovskite Crystal ◽  
Planar Heterojunction

A compact seed perovskite layer (CSPL) with a p–i–n planar heterojunction structure for perovskite solar cells achieved a 19.24% power conversion efficiency with a record open circuit voltage of 1.16 V and 20.37% PCE was achieved with a CSPL assisted n–i–p structure in a pure crystal perovskite film. The CSPL assists vertical growth of the perovskite crystal to enhance device performance.

scholarly journals Understanding the Impact of Cu-In-Ga-S Nanoparticles Compactness on Holes Transfer of Perovskite Solar Cells

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 286 ◽  
Author(s):  
Dandan Zhao ◽  
Yinghui Wu ◽  
Bao Tu ◽  
Guichuan Xing ◽  
Haifeng Li ◽  
...  
Keyword(s):  
Grain Size ◽  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Device Performance ◽  
Device Structure ◽  
Optimal Point ◽  
Hole Transfer ◽  
Coverage Ratio ◽  
The Impact

Although a compact holes-transport-layer (HTL) film has always been deemed mandatory for perovskite solar cells (PSCs), the impact their compactness on the device performance has rarely been studied in detail. In this work, based on a device structure of FTO/CIGS/perovskite/PCBM/ZrAcac/Ag, that effect was systematically investigated with respect to device performance along with photo-physics characterization tools. Depending on spin-coating speed, the grain size and coverage ratio of those CIGS films on FTO substrates can be tuned, and this can result in different hole transfer efficiencies at the anode interface. At a speed of 4000 r.p.m., the band level offset between the perovskite and CIGS modified FTO was reduced to a minimum of 0.02 eV, leading to the best device performance, with conversion efficiency of 15.16% and open-circuit voltage of 1.04 V, along with the suppression of hysteresis. We believe that the balance of grain size and coverage ratio of CIGS interlayers can be tuned to an optimal point in the competition between carrier transport and recombination at the interface based on the proposed mechanism. This paper definitely deepens our understanding of the hole transfer mechanism at the interface of PSC devices, and facilitates future design of high-performance devices.

scholarly journals Improving the triple-cation perovskite solar cells by two-step deposition methods with perovskite seeds

2021 ◽  
Vol 2145 (1) ◽  
pp. 012028
Author(s):  
P Phiromruk ◽  
S Chatraphorn
Keyword(s):  
Solar Cells ◽  
Spin Coating ◽  
Organic Cation ◽  
Perovskite Solar Cells ◽  
Deposition Process ◽  
Device Performance ◽  
Perovskite Layer ◽  
Cesium Ion ◽  
Ion Incorporation ◽  
Lead Halide

Abstract As of recent years, triple-cation perovskite solar cells have received immense attention due to its superior efficiency and better stability comparing to the classic single-cation perovskite solar cells such as MAPbI3 or FAPbI3. A triple-cation perovskite layer which has been used most recently is cesium-containing FAPbI3-based perovskite. One of decent approaches to fabricate the layer is spin-coating technique by using two-step deposition process in which mixed lead-halide and CsI precursor is firstly spin-coated onto a substrate, then organic cation solution is deposited on the lead-halide layer. In this work, the results show that the performance of the devices from this process is lower than expected that could be due to difficulty of cesium ion incorporation as a stabilizer for FAPbI3-based perovskite. Perovskite seeding growth is introduced to solve the problem where the process is slightly modified from conventional two-step deposition methods by adding small amount of perovskite seed precursor into PbI2 solution. The concentration of the perovskite seed in PbI2 solution was varied for 0, 7, 14 and 20% v/v. The highest average efficiency of 11.9% was obtained from 7% v/v seeding concentration. Furthermore, the device performance could be improved by using proper amount of chlorobenzene (CB) as an anti-solvent. The highest efficiency of 18.4% was achieved by using 30 µl of chlorobenzene.

Imidazole core to construct dopant-free asymmetric hole-transporting material for efficient inverted perovskite solar cells

2021 ◽  
Author(s):  
Yang Cheng ◽  
Quanping Wu ◽  
Ming Luo ◽  
Haolin Wang ◽  
Song Xue ◽  
...  
Keyword(s):  
Solar Cells ◽  
Direct Contact ◽  
Bottom Electrode ◽  
Perovskite Solar Cells ◽  
Perovskite Layer ◽  
Hole Transporting ◽  
Hole Transporting Material ◽  
Hole Transporting Materials

As the sandwiched hole transporting materials (HTMs) layers are in direct contact with up-coated perovskite layer and bottom electrode in p-i-n structured perovskite (i-PSCs), the film quality of HTMs determines...

scholarly journals Improving the Morphology of the Perovskite Absorber Layer in Hybrid Organic/Inorganic Halide Perovskite MAPbI3 Solar Cells

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
I. J. Ogundana ◽  
S. Y. Foo
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
High Performance ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Perovskite Layer ◽  
Large Variability

Recently, perovskite solar cells have attracted tremendous attention due to their excellent power conversion efficiency, low cost, simple fabrications, and high photovoltaic performance. Furthermore, the perovskite solar cells are lightweight and possess thin film and semitransparency. However, the nonuniformity in perovskite layer constitutes a major setback to the operation mechanism, performance, reproducibility, and degradation of perovskite solar cells. Therefore, one of the main challenges in planar perovskite devices is the fabrication of high quality films with controlled morphology and least amount of pin-holes for high performance thin film perovskite devices. The poor reproducibility in perovskite solar cells hinders the accurate fabrication of practical devices for use in real world applications, and this is primarily as a result of the inability to control the morphology of perovskites, leading to large variability in the characteristics of perovskite solar cells. Hence, the focus of research in perovskites has been mostly geared towards improving the morphology and crystallization of perovskite absorber by selecting the optimal annealing condition considering the effect of humidity. Here we report a controlled ambient condition that is necessary to grow uniform perovskite crystals. A best PCE of 7.5% was achieved along with a short-circuit current density of 15.2 mA/cm2, an open-circuit voltage of 0.81 V, and a fill factor of 0.612 from the perovskite solar cell prepared under 60% relative humidity.

scholarly journals Enhancing quality of CsPbIBr2 inorganic perovskite via cellulose acetate addition for high-performance perovskite solar cells

2022 ◽  
Vol 71 (1) ◽  
pp. 018802-018802
Author(s):  
Wang Gui-Qiang ◽  
◽  
Bi Jia-Yu ◽  
Liu Jie-Qiong ◽  
Lei Miao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Cellulose Acetate ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite
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