Although Cu2ZnSn(Sx,Se1-x)4(CZTSSe)is a promising candidate for thin-film photovoltaics,its cell performance is currently limited by the large voltage loss.Although a series of studies on the efficiency loss mechanism...Although Cu2ZnSn(Sx,Se1-x)4(CZTSSe)is a promising candidate for thin-film photovoltaics,its cell performance is currently limited by the large voltage loss.Although a series of studies on the efficiency loss mechanism of CZTSSe solar cell have been carried out in the past few years,no convincing understanding has been obtained until now.In this review,the current findings regarding the underlying mechanism of the efficiency loss in CZTSSe solar cells are systematically summarized and analyzed.The properties of atomic disorder and deep defects in CZTSSe materials and their effects on device performance are discussed.The synergistic effect is proposed to help understand the defect-related charge loss in the absorber.Furthermore,the experimental methods of defect identification and defect control are presented,in an attempt to identify the killer defects that can be responsible for the ultra-short minority lifetime of CZTSSe material.By comprehensively and dialectically understanding these defect properties of the CZTSSe solar cell,we believe breakthrough in the cell efficiency will come soon with our concentrated effort.展开更多
Objective： To study retrospectively 20 hip revison patients treated by cementless total hip arthroplasty with structural allograft. Methods： Twenty patients suffering from aseptic loosening of an uncemented cup com...Objective： To study retrospectively 20 hip revison patients treated by cementless total hip arthroplasty with structural allograft. Methods： Twenty patients suffering from aseptic loosening of an uncemented cup complicated by a large defect underwent cementless total hip arthroplasty with structural allograft and were followed up for at least 5 years. Clinical results were evaluated by Harris score and leg length measurements. Radiographic analysis included implants migration, graft absorbance, osteolysis and liner wear. Results： No cup loosening or graft reabsorption was found at final follow-up. Clinical improvements in pain and functional status were demonstrated during the follow-up period. The mean Harris hip scores improved from 29 preoperatively （range 20-41） to 81 postoperatively （range 73-89）. Conclusion： Our study shows that cementless total hip arthroplasty with allograft is a good way for massive defect in aeetabular bone stock.展开更多
基金supported by the National Natural Science Foundation of China(51961165108,51421002,51972332 and 51627803)。
文摘Although Cu2ZnSn(Sx,Se1-x)4(CZTSSe)is a promising candidate for thin-film photovoltaics,its cell performance is currently limited by the large voltage loss.Although a series of studies on the efficiency loss mechanism of CZTSSe solar cell have been carried out in the past few years,no convincing understanding has been obtained until now.In this review,the current findings regarding the underlying mechanism of the efficiency loss in CZTSSe solar cells are systematically summarized and analyzed.The properties of atomic disorder and deep defects in CZTSSe materials and their effects on device performance are discussed.The synergistic effect is proposed to help understand the defect-related charge loss in the absorber.Furthermore,the experimental methods of defect identification and defect control are presented,in an attempt to identify the killer defects that can be responsible for the ultra-short minority lifetime of CZTSSe material.By comprehensively and dialectically understanding these defect properties of the CZTSSe solar cell,we believe breakthrough in the cell efficiency will come soon with our concentrated effort.
文摘Objective： To study retrospectively 20 hip revison patients treated by cementless total hip arthroplasty with structural allograft. Methods： Twenty patients suffering from aseptic loosening of an uncemented cup complicated by a large defect underwent cementless total hip arthroplasty with structural allograft and were followed up for at least 5 years. Clinical results were evaluated by Harris score and leg length measurements. Radiographic analysis included implants migration, graft absorbance, osteolysis and liner wear. Results： No cup loosening or graft reabsorption was found at final follow-up. Clinical improvements in pain and functional status were demonstrated during the follow-up period. The mean Harris hip scores improved from 29 preoperatively （range 20-41） to 81 postoperatively （range 73-89）. Conclusion： Our study shows that cementless total hip arthroplasty with allograft is a good way for massive defect in aeetabular bone stock.
