It is well known that [6,6]-phenyl-C<sub><span style="font-size:12px;font-family:Verdana;">61</span></sub><span style="font-size:12px;font-family:Verdana;">-butyric ac...It is well known that [6,6]-phenyl-C<sub><span style="font-size:12px;font-family:Verdana;">61</span></sub><span style="font-size:12px;font-family:Verdana;">-butyric acid methyl ester (PCBM) is a common n-type passivation material in PSCs, usually used as an interface modification layer. However, PCBM is extremely expensive and is not suitable for future industrialization. Herein, the various concentrations of PCBM as an additive are adopted for PSCs. It not only avoids the routine process of spin coating the multi-layer films, but also reduces the PCBM material and cost. Meanwhile, PCBM can passivate the grain surface and modulate morphology of perovskite films. Furthermore, the most important optical parameters of solar cells, the current density (</span><i><span style="font-size:12px;font-family:Verdana;">J</span><sub><span style="font-size:12px;font-family:Verdana;">sc</span></sub></i><span style="font-size:12px;font-family:Verdana;">), fill factor (FF), open-circuit voltage (</span><i><span style="font-size:12px;font-family:Verdana;">V</span><sub><span style="font-size:12px;font-family:Verdana;">oc</span></sub></i><span style="font-size:12px;font-family:Verdana;">) and power conversion efficiencies (PCE) were improved. Especially, when the PCBM doping ratio in CH</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;">NH</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;">PbI</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;"> (MAPbI</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;">) precursor solution was 1</span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "=""><span style="font-size:12px;font-family:Verdana;">wt%, the device obtained the smallest </span><i><span style="font-size:12px;font-family:Verdana;">V</span><sub><span style="font-size:12px;font-family:Verdana;">oc</span></sub></i><span style="font-size:12px;font-family:Verdana;"> decay (less than 1%) in the p-i-n type PSCs with poly</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "=""><span style="font-size:12px;font-family:Verdana;">(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) as hole transport layer (HTL) and fullerene (C</span><sub><span style="font-size:12px;font-family:Verdana;">60</span></sub><span style="font-size:12px;font-family:Verdana;">) as electron transport layer (ETL). The PSCs </span><i><span style="font-size:12px;font-family:Verdana;">V</span><sub><span style="font-size:12px;font-family:Verdana;">oc</span></sub></i><span style="font-size:12px;font-family:Verdana;"> stability improvement is attri</span><span style="font-size:12px;font-family:Verdana;">buted to enhanced crystallinity of photoactive layer and decreased non-radiative </span><span style="font-size:12px;font-family:Verdana;">recombination by PCBM doping in the perovskites.</span></span></span></span>展开更多
Abnormal expression of hydrogen peroxide(H_(2)O_(2))indicates the disorder of cell functions and is able to induce the occurrence and deterioration of numerous diseases.However,limited by its low concentration under p...Abnormal expression of hydrogen peroxide(H_(2)O_(2))indicates the disorder of cell functions and is able to induce the occurrence and deterioration of numerous diseases.However,limited by its low concentration under pathophysiological conditions,intracellular H_(2)O_(2) is still difficult to be determined to date.Herein,to achieve sensitive quantification of H_(2)O_(2) in cells,CIS/ZnS/ZnS quantum dots(CIS/d-ZnS QDs)are retrofitted with ZnO shells via self-passivation.Different from the traditional self-passivation of QDs,self-passivation of CIS/d-ZnS QDs is realized facilely without the assistance of additional cation ions,which improves optical properties of QDs and equips the QDs with a sensing layer.As a result,the CIS/d-ZnS/ZnO QDs exhibit enhanced fluorescence emission and stability.Relying on the decomposition of ZnO and ZnS shells in the presence of H_(2)O_(2),aggregated QDs reveal exciton energy transfer effect,resulting in fluorescence quenching.On a basis of this principle,a fluorescence H_(2)O_(2) sensor is further established with the CIS/d-ZnS/ZnO QDs.To be noted,since the equipped ZnO shells are more susceptible to H2O2 than original ZnS shells,analytical performance of the fluorescence sensor is remarkably promoted by the self-passivation of QDs.Accordingly,H_(2)O_(2) can be measured in 5 orders of magnitude with a limit of detection(LOD)of 0.46 nM.Furthermore,because the ZnO shells improve H2O2-responsive selectivity and sensitivity,variation of H_(2)O_(2) in cells can also be quantified with the CIS/d-ZnS/ZnO QDs.In this work,sensitive detection of intracellular H_(2)O_(2) is enabled by equipping QDs with a sensing layer,which provides an alternative perspective of functionalizing nanomaterials for analytical applications.展开更多
文摘It is well known that [6,6]-phenyl-C<sub><span style="font-size:12px;font-family:Verdana;">61</span></sub><span style="font-size:12px;font-family:Verdana;">-butyric acid methyl ester (PCBM) is a common n-type passivation material in PSCs, usually used as an interface modification layer. However, PCBM is extremely expensive and is not suitable for future industrialization. Herein, the various concentrations of PCBM as an additive are adopted for PSCs. It not only avoids the routine process of spin coating the multi-layer films, but also reduces the PCBM material and cost. Meanwhile, PCBM can passivate the grain surface and modulate morphology of perovskite films. Furthermore, the most important optical parameters of solar cells, the current density (</span><i><span style="font-size:12px;font-family:Verdana;">J</span><sub><span style="font-size:12px;font-family:Verdana;">sc</span></sub></i><span style="font-size:12px;font-family:Verdana;">), fill factor (FF), open-circuit voltage (</span><i><span style="font-size:12px;font-family:Verdana;">V</span><sub><span style="font-size:12px;font-family:Verdana;">oc</span></sub></i><span style="font-size:12px;font-family:Verdana;">) and power conversion efficiencies (PCE) were improved. Especially, when the PCBM doping ratio in CH</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;">NH</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;">PbI</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;"> (MAPbI</span><sub><span style="font-size:12px;font-family:Verdana;">3</span></sub><span style="font-size:12px;font-family:Verdana;">) precursor solution was 1</span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "=""><span style="font-size:12px;font-family:Verdana;">wt%, the device obtained the smallest </span><i><span style="font-size:12px;font-family:Verdana;">V</span><sub><span style="font-size:12px;font-family:Verdana;">oc</span></sub></i><span style="font-size:12px;font-family:Verdana;"> decay (less than 1%) in the p-i-n type PSCs with poly</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "=""><span style="font-size:12px;font-family:Verdana;">(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) as hole transport layer (HTL) and fullerene (C</span><sub><span style="font-size:12px;font-family:Verdana;">60</span></sub><span style="font-size:12px;font-family:Verdana;">) as electron transport layer (ETL). The PSCs </span><i><span style="font-size:12px;font-family:Verdana;">V</span><sub><span style="font-size:12px;font-family:Verdana;">oc</span></sub></i><span style="font-size:12px;font-family:Verdana;"> stability improvement is attri</span><span style="font-size:12px;font-family:Verdana;">buted to enhanced crystallinity of photoactive layer and decreased non-radiative </span><span style="font-size:12px;font-family:Verdana;">recombination by PCBM doping in the perovskites.</span></span></span></span>
基金This work was supported by the National Natural Science Foundation of China(Nos.21625502,21974070,and 22176099)the Natural Science Foundation of Jiangsu Province of China(Nos.BK20191367 and BK20192008).
文摘Abnormal expression of hydrogen peroxide(H_(2)O_(2))indicates the disorder of cell functions and is able to induce the occurrence and deterioration of numerous diseases.However,limited by its low concentration under pathophysiological conditions,intracellular H_(2)O_(2) is still difficult to be determined to date.Herein,to achieve sensitive quantification of H_(2)O_(2) in cells,CIS/ZnS/ZnS quantum dots(CIS/d-ZnS QDs)are retrofitted with ZnO shells via self-passivation.Different from the traditional self-passivation of QDs,self-passivation of CIS/d-ZnS QDs is realized facilely without the assistance of additional cation ions,which improves optical properties of QDs and equips the QDs with a sensing layer.As a result,the CIS/d-ZnS/ZnO QDs exhibit enhanced fluorescence emission and stability.Relying on the decomposition of ZnO and ZnS shells in the presence of H_(2)O_(2),aggregated QDs reveal exciton energy transfer effect,resulting in fluorescence quenching.On a basis of this principle,a fluorescence H_(2)O_(2) sensor is further established with the CIS/d-ZnS/ZnO QDs.To be noted,since the equipped ZnO shells are more susceptible to H2O2 than original ZnS shells,analytical performance of the fluorescence sensor is remarkably promoted by the self-passivation of QDs.Accordingly,H_(2)O_(2) can be measured in 5 orders of magnitude with a limit of detection(LOD)of 0.46 nM.Furthermore,because the ZnO shells improve H2O2-responsive selectivity and sensitivity,variation of H_(2)O_(2) in cells can also be quantified with the CIS/d-ZnS/ZnO QDs.In this work,sensitive detection of intracellular H_(2)O_(2) is enabled by equipping QDs with a sensing layer,which provides an alternative perspective of functionalizing nanomaterials for analytical applications.
