【摘 要】
：
Lead(Pb)0 and iodine(I)0 point defects generated during perovskite solar cell(PSC)fabrication and pho-toconversion form deep band energy levels as the carriers'
【机 构】
：
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University
论文部分内容阅读
Lead(Pb)0 and iodine(I)0 point defects generated during perovskite solar cell(PSC)fabrication and pho-toconversion form deep band energy levels as the carriers'recombination centers.These defects not only deteriorate device efficiency,but also facilitate chemical degradation with ion migration,resulting in restricted device lifetime.Herein,we present a novel type of phosphines as the point defects stabilizer for hybrid perovskite solar cells with enhanced performances.Three phosphines with varied side groups of tributyl,trioctyl and triphenyl are exampled as the dopants in perovskite films.The group dependent redox properties were observed in the perovskite film,dependent on their molecular weights and steric hinderances of phosphines.The partially oxidized tributyl phosphine(TBUP)with additional tributyl phosphine oxides(TBPO)is efficient in reduction of lead(Pb)0 and iodine(I)0 concentrations during the device fabrication and operation.The device with TBUP-TBPO pair showed enhanced power conver-sion efficiency(PCE)to 20.48％and maintain 91.7％of their initial PCEs after 500 h at 65 ℃ thermal annealing.Thus,this work presents an efficient route of utilize the phosphine species to reduce point defects in the perovskite film,which promoting further development of novel phosphorous additives with defects stabilization,interface passivation and encapsulation for low-cost solution processed PSCs.
其他文献
Transition-metal based M-N4/C catalysts are appealing for electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).Employing model c
Excessive nitrate in groundwater has emerged as a serious environmental concern.The elevated nitrate concentration in drinking water causes a serious threat to
Lithium-sulfur(Li-S)batteries have great potential in next-generation energy storage due to its high theoretical specific capacity and energy density.However,there are several challenges to the practical application of Li-S batteries including the growth
A membrane with high stability and ion conductivity in wide pH range is essential for energy storage devices.Here,we report a novel membrane with hierarchical c
Taking advantage of the excellent stability and photoelectric properties,two-dimensional(2D)organicinorganic halide perovskites have been widely researched and applied in optoelectronic and photovoltaic devices.The remarkable properties are attributed to
Electrochemical hydrogen evolution reaction(HER) is a promising route to harvest high-purity hydrogen(H2).Efficient and selective energy transformations rely on the development of novel catalytic materials in terms of compositions and structure
All-solid-state lithium batteries (ASSLBs) employing sulfide electrolyte and lithium (Li) anode have received increasing attention due to the intrinsic safety a
EAB zeolite was successfully prepared and applied to selective adsorption of Li+,Na+ and K+ ions.The physical and chemical properties of the adsorbent were char
Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of capacitors.Titanium dioxide
Nitrogen reduction reaction (NRR) under ambient conditions is always a long-standing challenge in science,due to the extreme difficulty in breaking the strong N