scholarly journals Foam-like 3D Graphene as a Charge Transport Modifier in Zinc Oxide Electron Transport Material in Perovskite Solar Cells

Photochem ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 523-536
Author(s):  
Mohamed Salleh Mohamed Saheed ◽  
Norani Muti Mohamed ◽  
Balbir Singh Mahinder Singh ◽  
Qamar Wali ◽  
Mohamed Shuaib Mohamed Saheed ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Charge Transport ◽  
Electrochemical Impedance ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Photocurrent Density ◽  
Transport Parameters ◽  
3D Graphene ◽  
A Charge

The effect of foam-like 3D graphene (3DG) in an electron transport material (ETM), viz. ZnO thin film, on the steady-state photoluminescence (PL), light-harvesting efficiency (LHE), photocurrent density (JSC), photovoltage (VOC), and charge transport parameters of perovskite solar cells (PSCs) are systematically investigated. The ETM is developed by spin coating a ZnO precursor solution containing varying amounts of 3DG on conducting glass substrates and appropriate annealing. A significant improvement in the photoconversion efficiency of PSCs is observed for a low concentration of 3DG in ZnO. The current–voltage and electrochemical impedance spectroscopy measurements show that the addition of 3DG enhances the VOC due to efficient electron–hole separation and charge transport compared to the pristine ZnO. These studies offer a route for further advances in enhancing the optoelectronic properties of ETM for artificial photosynthesis and photocatalysis devices.

scholarly journals The Influence of the Thickness of Compact TiO2 Electron Transport Layer on the Performance of Planar CH3NH3PbI3 Perovskite Solar Cells

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3295
Author(s):  
Andrzej Sławek ◽  
Zbigniew Starowicz ◽  
Marek Lipiński
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Transport Layer ◽  
Electron Transport Layer

In recent years, lead halide perovskites have attracted considerable attention from the scientific community due to their exceptional properties and fast-growing enhancement for solar energy harvesting efficiency. One of the fundamental aspects of the architecture of perovskite-based solar cells (PSCs) is the electron transport layer (ETL), which also acts as a barrier for holes. In this work, the influence of compact TiO2 ETL on the performance of planar heterojunction solar cells based on CH3NH3PbI3 perovskite was investigated. ETLs were deposited on fluorine-doped tin oxide (FTO) substrates from a titanium diisopropoxide bis(acetylacetonate) precursor solution using the spin-coating method with changing precursor concentration and centrifugation speed. It was found that the thickness and continuity of ETLs, investigated between 0 and 124 nm, strongly affect the photovoltaic performance of PSCs, in particular short-circuit current density (JSC). Optical and topographic properties of the compact TiO2 layers were investigated as well.

Stabilization of Intrinsic Ions in Perovskite Solar Cells by Employment of a Bipolar Star-Shaped Organic Molecule as a Charge Transport Buffer

2020 ◽  
Vol 3 (11) ◽  
pp. 10632-10641
Author(s):  
Wei-Wei Zuo ◽  
Meng Li ◽  
Wan-Sheng Zong ◽  
Shen-Gang Xu ◽  
Ying-Liang Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transport ◽  
Organic Molecule ◽  
Perovskite Solar Cells ◽  
A Charge ◽  
Transport Buffer

scholarly journals Investigation of the Effects of Various Organic Solvents on the PCBM Electron Transport Layer of Perovskite Solar Cells

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 237
Author(s):  
Chih-Hung Tsai ◽  
Chia-Ming Lin ◽  
Cheng-Hao Kuei
Keyword(s):  
Surface Roughness ◽  
Solar Cells ◽  
Electron Transport ◽  
Organic Solvents ◽  
Electrochemical Impedance ◽  
Perovskite Solar Cells ◽  
Acid Methyl Ester ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
X Ray

In this study, four organic solvents including 1,2-dichlorobenzene (DCB), chlorobenzene (CB), methylbenzene (MB), and chloroform (CF) were used as solvents in the [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) electron transport layer (ETL) of perovskite solar cells (PSCs). This study observed the effects of various solvents on the surface morphology of the ETL by using an optical microscope (OM) and scanning electron microscope (SEM). The surface roughness, crystal structure, and surface element bonding of the ETL were observed using an atomic force microscope (AFM), X-ray diffractometer (XRD), and X-ray photoelectron spectroscope (XPS), respectively. The absorption spectrum of the perovskite layer was explored using an ultraviolet-visible (UV-Vis) spectrometer. The characteristics of the PSC device were analyzed in terms of its current density–voltage (J–V) curve, external quantum efficiency (EQE), and electrochemical impedance spectroscopy (EIS) measurements. The results showed that DCB is a solvent with a high boiling point, low vapor pressure, and high dielectric constant, and using DCB as the solvent for ETL, the uniformity, coverage, and surface roughness of the ETL showed better properties. The power conversion efficiency of the PSC in which DCB was used as the solvent achieved a value of 11.07%, which was higher than that of the PSCs in which other solvents were used.

scholarly journals High-Performance and Hysteresis-Free Perovskite Solar Cells Based on Rare-Earth-Doped SnO2 Mesoporous Scaffold

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Qiyao Guo ◽  
Jihuai Wu ◽  
Yuqian Yang ◽  
Xuping Liu ◽  
Zhang Lan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Rare Earth ◽  
Electron Transport ◽  
Charge Transport ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Rare Earth Doping ◽  
Perovskite Layer

Tin oxide (SnO2), as electron transport material to substitute titanium oxide (TiO2) in perovskite solar cells (PSCs), has aroused wide interests. However, the performance of the PSCs based on SnO2 is still hard to compete with the TiO2-based devices. Herein, a novel strategy is designed to enhance the photovoltaic performance and long-term stability of PSCs by integrating rare-earth ions Ln3+ (Sc3+, Y3+, La3+) with SnO2 nanospheres as mesoporous scaffold. The doping of Ln promotes the formation of dense and large-sized perovskite crystals, which facilitate interfacial contact of electron transport layer/perovskite layer and improve charge transport dynamics. Ln dopant optimizes the energy level of perovskite layer, reduces the charge transport resistance, and mitigates the trap state density. As a result, the optimized mesoporous PSC achieves a champion power conversion efficiency (PCE) of 20.63% without hysteresis, while the undoped PSC obtains an efficiency of 19.01%. The investigation demonstrates that the rare-earth doping is low-cost and effective method to improve the photovoltaic performance of SnO2-based PSCs.

scholarly journals Nanoscale localized contacts for high fill factors in polymer-passivated perovskite solar cells

Science ◽  
2021 ◽  
Vol 371 (6527) ◽  
pp. 390-395
Author(s):  
Jun Peng ◽  
Daniel Walter ◽  
Yuhao Ren ◽  
Mike Tebyetekerwa ◽  
Yiliang Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Charge Transport ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Hole Transport Layer ◽  
Free Hole ◽  
Trade Off

Polymer passivation layers can improve the open-circuit voltage of perovskite solar cells when inserted at the perovskite–charge transport layer interfaces. Unfortunately, many such layers are poor conductors, leading to a trade-off between passivation quality (voltage) and series resistance (fill factor, FF). Here, we introduce a nanopatterned electron transport layer that overcomes this trade-off by modifying the spatial distribution of the passivation layer to form nanoscale localized charge transport pathways through an otherwise passivated interface, thereby providing both effective passivation and excellent charge extraction. By combining the nanopatterned electron transport layer with a dopant-free hole transport layer, we achieved a certified power conversion efficiency of 21.6% for a 1-square-centimeter cell with FF of 0.839, and demonstrate an encapsulated cell that retains ~91.7% of its initial efficiency after 1000 hours of damp heat exposure.

Improved charge transport of Nb-doped TiO2nanorods in methylammonium lead iodide bromide perovskite solar cells

2014 ◽  
Vol 2 (46) ◽  
pp. 19616-19622 ◽  
Author(s):  
Mengjin Yang ◽  
Rui Guo ◽  
Kamal Kadel ◽  
Yunyan Liu ◽  
Kevin O'Shea ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Charge Transport ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Transport Medium ◽  
Different Temperatures ◽  
Methylammonium Lead Iodide

The phase of perovskite evolves when the non-stoichiometric mixed halide precursor is baked at different temperatures. Nb-doped TiO2nanorods are superior to plain nanorods as electron transport medium in crystallized perovskite.

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