Search

We introduce a novel method for fabricating perovskite solar modules using selective spin-coating on various Au/ITO patterned substrates. These patterns were engineered for two purposes: (1) to enhance selectivity of monolayers primarily self-assembling on the Au electrode, and (2) to enable seamless interconnection between cells through direct contact of the top electrode and the hydrophobic Au connection electrode. Utilizing SAMs-treated Au/ITO, we achieved sequential selective deposition of the electron transport layer (ETL) and the perovskite layer on the hydrophilic amino-terminated ITO, while the hole transport layer (HTL) was deposited on the hydrophobic CH3-terminated Au connection electrodes. Importantly, our approach had a negligible impact on the series resistance of the solar cells, as evidenced by the measured specific contact resistivity of the multilayers. A significant outcome was the production of a six-cell series-connected solar module with a notable average PCE of 8.32%, providing a viable alternative to the conventional laser scribing technique. [ABSTRACT FROM AUTHOR]

The present study investigated the effect of a silane flow rate on chemical bonding structures of silicon nanowires (SiNWs) synthesized by atmospheric pressure chemical vapor deposition. The structural and chemical bonding structures were studied by Raman spectroscopy, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy. The peak at 500 cm-1 in Raman spectra indicated the nanocrystalline SiNWs with outer matrix of a-Si/SiO2. X-ray photoelectron spectroscopy has been used to study the electronic structure and plasmon energy of SiNWs. The electronic environments of core orbital spectra of Si(2p) and O(1s) have been analyzed by the binding energy between constituent atoms. The plasmon spectra from different nanowires were estimated from curve fitting techniques with varying SiH4 flow rate. The peak at 17 eV is due to the Si plasmon in core SiNWs while the peak for interstitial Au appeared at ∼10 eV. [ABSTRACT FROM AUTHOR]

Methyl-ammonium lead bromide (MAPbBr 3 ) is currently studying due to its potential application to high open circuit voltage photovoltaic device. Due to the limited solubility of methyl ammonium bromide (MABr) in iso-propyl alcohol (IPA), the MAPbBr 3 was only fabricated by one step (1-step) spin coating process. In this article, we alternatively used ethanol and methanol as solvent to dissolve MABr to fabricate MAPbBr 3 films by two steps (2-steps) spin coating process. As a result, we observed a dense, closed stacked and aligned perovskite nanocubes array using a varying concentration of MABr and waiting time. Our best device with an architecture of FTO/TiO 2 /MAPbBr 3 /Spiro-OMeTAD/Au shows a current density of 9.31 mA/cm 2 , open circuit voltage of 1.05 V, and fill factor of 0.58 with a power conversion efficiency of 5.70%. We were optimistic that these MAPbBr 3 nanocube arrays would be applicable to solar cell as well as other optoelectronic devices such as photodetector, light emitting diode and X-ray scintillator. [ABSTRACT FROM AUTHOR]