Quantum dot sensitized solar cells with efficiency over 12% based on tetraethyl orthosilicate additive in polysulfide electrolyte
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Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2017 Supplementary Information (SI) Quantum dot sensitized solar cells with efficiency over 12% based on tetraethyl orthosilicate additive in polysulfide electrolyte Juan Yu, ab Wenran Wang, a Zhenxiao Pan, b Jun Du, a Zhenwei Ren, a Weinan Xue a and Xinhua Zhong* ab a Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China b College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou 510642, China *Corresponding author Email: zhongxh@ecust.edu.cn

Fig. S1 J V curves of ZCISe based QDSCs with (6 vol%) and without Na 2 SiO 3 in the modified polysulfide electrolyte under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). Table S1 Individual photovoltaic parameters of ZCISe based QDSCs with (6 vol%) and without Na 2 SiO 3 in the modified polysulfide electrolyte under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). Na 2 SiO 3 Concentration (vol%) V oc (V) J sc (ma cm -2 ) FF PCE (%) 0.595 25.59 0.601 9.15 0.583 25.93 0.608 9.19 0 0.593 25.77 0.605 9.25 0.588 26.19 0.598 9.21 0.584 25.49 0.611 9.10 Average 0.589±0.005 25.79±0.28 0.605±0.005 9.18±0.06 6 0.615 0.622 0.616 0.612 0.610 26.22 26.06 26.44 26.81 26.43 0.596 0.586 0.590 0.585 0.598 9.61 9.50 9.61 9.60 9.64 Average 0.615±0.005 26.39±0.28 0.591±0.006 9.59±0.05

Fig. S2 J V curves of ZCISe based QDSCs with different TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ).

Table S2 Individual photovoltaic parameters of ZCISe based QDSCs with different TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). TEOS Concentration (vol%) V oc (V) J sc (ma cm -2 ) FF PCE (%) 0.595 25.59 0.601 9.15 0.583 25.93 0.608 9.19 0 0.593 25.77 0.605 9.25 0.588 26.19 0.598 9.21 0.584 25.49 0.611 9.10 Average 0.589±0.005 25.79±0.28 0.605±0.005 9.18±0.06 0.611 26.68 0.597 9.74 0.617 26.59 0.595 9.76 3 0.615 26.32 0.603 9.76 0.624 26.39 0.600 9.88 0.613 26.49 0.598 9.71 Average 0.616±0.005 26.49±0.15 0.599±0.003 9.77±0.07 6 0.626 26.89 0.609 10.25 0.632 27.00 0.595 10.14 0.629 26.91 0.607 10.27 0.630 26.41 0.598 9.95 0.622 27.00 0.608 10.21 Average 0.628±0.004 26.84±0.25 0.603±0.006 10.16±0.13 9 0.615 0.622 0.616 0.612 0.610 26.22 26.06 26.44 26.81 26.43 0.596 0.586 0.590 0.585 0.598 9.61 9.50 9.61 9.60 9.64 Average 0.615±0.005 26.39±0.28 0.591±0.006 9.59±0.05

Fig. S3 J-V curves of CdSe based QDSCs with different TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ).

Table S3 Individual photovoltaic parameters of CdSe based QDSCs with different TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). TEOS Concentration (vol%) 0 V oc (V) J sc (ma cm -2 ) FF PCE (%) 0.643 15.60 0.668 6.70 0.653 15.91 0.659 6.82 0.644 15.80 0.668 6.80 0.652 15.93 0.653 6.78 0.647 15.96 0.658 6.80 Average 0.648±0.005 15.84±0.15 0.661±0.007 6.78±0.05 3 0.664 16.26 0.658 7.11 0.663 16.34 0.651 7.06 0.664 16.41 0.649 7.07 0.663 15.81 0.686 7.19 0.662 16.01 0.682 7.23 Average 0.663±0.001 16.17±0.25 0.665±0.018 7.13±0.18 6 0.663 16.20 0.681 7.31 0.664 16.41 0.673 7.34 0.665 16.49 0.660 7.24 0.663 16.31 0.679 7.34 0.663 16.12 0.682 7.28 Average 0.664±0.001 16.31±0.15 0.675±0.009 7.30±0.04 9 0.666 0.652 0.657 0.664 0.652 16.40 15.98 16.05 16.01 15.96 0.639 0.657 0.648 0.651 0.655 6.98 6.84 6.83 6.92 6.83 Average 0.658±0.007 16.07±0.19 0.650±0.007 6.88±0.07

Fig. S4 J V curves of CdSeTe based QDSCs with different TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ).

Table S4 Individual photovoltaic parameters of CdSeTe based QDSCs with different TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). TEOS Concentration (vol%) 0 V oc (V) J sc (ma cm -2 ) FF PCE (%) 0.678 20.83 0.626 8.84 0.668 20.88 0.633 8.83 0.670 21.17 0.627 8.89 0.665 20.91 0.625 9.12 0.674 21.01 0.632 8.95 Average 0.671±0.005 20.96±0.14 0.629±0.004 8.93±0.12 3 0.695 0.696 0.690 0.696 0.698 21.16 21.18 21.15 21.21 21.35 0.642 0.644 0.640 0.636 0.639 9.44 9.49 9.34 9.39 9.52 Average 0.695±0.003 21.21±0.08 0.640±0.003 9.44±0.07 6 0.702 21.36 0.650 9.75 0.699 21.32 0.646 9.63 0.705 21.31 0.645 9.69 0.708 21.38 0.638 9.66 0.703 21.43 0.651 9.81 Average 0.703±0.003 21.36±0.05 0.646±0.005 9.71±0.07 9 0.686 0.682 0.688 0.684 0.680 21.20 21.27 21.23 21.17 21.28 0.628 0.636 0.632 0.633 0.630 9.13 9.23 9.23 9.17 9.12 Average 0.684±0.003 21.23±0.05 0.632±0.003 9.18±0.05

Fig. S5 J V curves of ZCISe based QDSCs with 6 vol% TEOS in the modified polysulfide electrolyte at staying time of 0, 3, 12, 24 and 48 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ).

Table S5 Individual photovoltaic parameters of ZCISe based QDSCs with 6 vol% TEOS in the modified polysulfide electrolyte at staying time of 0, 3, 12, 24 and 48 h under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). Time (h) V oc (V) J sc (ma cm -2 ) FF PCE (%) 0.586 26.15 0.599 9.18 0.583 25.93 0.606 9.16 0 0.587 26.25 0.597 9.20 0.579 25.89 0.609 9.13 0.582 25.94 0.608 9.18 Average 0.583±0.003 26.03±0.16 0.604±0.005 9.17±0.03 0.603 26.09 0.602 9.47 0.615 25.79 0.592 9.39 3 0.603 26.13 0.601 9.47 0.610 26.11 0.592 9.43 0.605 26.20 0.598 9.48 Average 0.607±0.005 26.06±0.16 0.597±0.005 9.45±0.04 12 0.623 26.43 0.600 9.88 0.628 26.37 0.599 9.92 0.623 26.35 0.605 9.93 0.627 26.53 0.594 9.88 0.625 26.47 0.593 9.81 Average 0.625±0.002 26.43±0.07 0.598±0.005 9.88±0.05 0.626 26.89 0.609 10.25 0.632 27.00 0.595 10.14 24 0.629 26.91 0.607 10.27 0.630 26.41 0.598 9.95 0.622 27.00 0.608 10.21 Average 0.628±0.004 26.84±0.25 0.603±0.006 10.16±0.13 48 0.620 0.621 0.612 0.622 0.620 26.39 26.34 26.51 26.41 26.61 0.596 0.604 0.599 0.599 0.594 9.75 9.88 9.72 9.84 9.80 Average 0.619±0.004 26.45±0.11 0.598±0.004 9.80±0.07

Fig. S6 J-V curves of ZCISe based QDSCs with 0 and 6 vol% TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h, applying Ti mesh supported mesoporous carbon (MC/Ti) counter electrodes under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). Table S6 Impedance Individual photovoltaic parameters of ZCISe based QDSCs with 0 and 6 vol% TEOS concentrations in the modified polysulfide electrolyte at staying time of 24 h, applying Ti mesh supported mesoporous carbon (MC/Ti) counter electrodes under the illumination of 1 full sun intensity (AM 1.5G, 100 mw/cm 2 ). TEOS Concentration (v%) 0 V oc (V) J sc (ma cm -2 ) FF PCE (%) 0.742 25.87 0.607 11.65 0.746 25.89 0.626 12.09 0.759 26.09 0.614 12.16 0.723 25.53 0.609 11.24 0.745 25.84 0.602 11.59 Average 0.743±0.013 25.84±0.20 0.612±0.009 11.75±0.38 6 0.781 26.61 0.601 12.49 0.758 26.13 0.618 12.24 0.781 25.92 0.624 12.63 0.773 26.15 0.605 12.23 0.747 26.97 0.602 12.13 Average 0.768±0.015 26.36±0.43 0.610±0.010 12.34±0.21

Table S7 Impedance parameters under the forward bias of 0.6 V. series resistance R s, recombination resistance R rec, chemical capacitance C μ, and electron lifetime τ n = R rec C μ. TEOS (vol%) R s W cm 2 R rec W cm 2 C μ mf cm -2 τ n ms 0 24.17 178.8 3.64 651 3 32.85 199.2 3.61 720 6 30.38 234.8 3.70 869 9 37.09 255.6 3.70 947 Fig. S7 Conductivity of electrolytes containing different TEOS volumetric fractions at 25 o C.

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