Laixiang Qin

• Peking University People's Hospital

Graphene is a favorable candidate for electrodes of organic light emitting diodes (OLEDs). Graphene has a quite high work function of ~4.5 eV, and has been extensively studied as anodes of OLEDs. In order to use graphene as a cathode, the electron injection barrier between the graphene cathode and the electron transport layer has to be low enough....

For a novel kind of solar cell (SC) material, it is critical to estimate how far the power conversion efficiencies (PCEs) of the SCs made of it can go. In 2010 Han and Chen proposed the equation for the ultimate efficiency of SCs without considering the carrier recombination η un. η un is capable of estimating the theoretical upper limits of the SC...

A novel effect of room-temperature diffusion and gettering of Au from the bulk to the surface defect region of a Si wafer stimulated by 5 MeV electron irradiation is demonstrated. The Au atoms were introduced into the Si wafer by ion implantation. According to the secondary ion mass spectrum and the minority carrier lifetime measurements, it is fou...

Removal of transition metal impurities from Si is conventionally based on various gettering methods, all needing a high temperature. In this work it is demonstrated that, in the condition of intentionally introduced surface defect regions, small dose γ-ray radiation can be used to stimulate fast diffusion of Au resulting in gettering Au from bulk S...

In a TiO2–perovskite heterojunction solar cell (TiO2–PHSC), besides the perovskite CH3NH3PbX3, TiO2 as one side of the TiO2/CH3NH3PbX3 heterojunction also plays an important role in the photovoltaic effect. In order to improve the performance of the TiO2–PHSC with the structure of glass/FTO/compact TiO2/mesoporous TiO2/CH3NH3PbI3–xClx /poly-TPD (po...