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We have developed a series of novel semiconducting polymers based on alternating ester substituted thieno thiophene and benzodithiophene units.

For the bright future-bulk heterojunction polymer solar cells with power conversion efficiency of 7.4%.

ADVANCED MATERIALS, no. 20 (2010): E135-+

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摘要

The photovoltaic performance of polymer bulk heterojunction solar cells is studied systematically. Using a new benzodithiophene polymer (PTB7) and PC71BM (see figure) a power conversion efficiency of 7.4% has been achieved in PTB7/PC71BM-blend film, indicating a great potential and bright future for polymer solar cells (FF = fill factor, ...更多

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简介
  • Sun is the largest carbon-neutral energy source that has not been fully utilized. there are solar cell devices based on inorganic semiconductor to efficiently harvest solar energy, the cost of these conventional devices is too high to be economically viable.
  • The resulting PTB7/PC71BM-blend film exhibits a strong absorption covering a range from 300 to about 800 nm.
重点内容
  • Sun is the largest carbon-neutral energy source that has not been fully utilized
  • At the heart of the organic photovoltaic (OPV) technology advantage is the easiness of the fabrication, which holds the promise of very low-cost manufacturing process
  • In the last fifteen years, a significant progress has been made on the improvement of the power-conversion efficiency (PCE) of polymer bulk heterojunction (BHJ) solar cells, and the achieved efficiencies have evolved from less than 1% in the poly(phenylene vinylene) (PPV) system in 1995,[2] to 4–5% in the poly(3-hexylthiphene) (P3HT) system in 2005,[4] to around 6%, as reported recently.[5]
  • We have developed a series of novel semiconducting polymers based on alternating ester substituted thieno[3,4-b]thiophene and benzodithiophene units.[10]. These polymers exhibit a synergistic combination of properties that lead to an excellent photovoltaic effect
  • The initial test results indicated that the device with a 1:1.5 wt-ratio exhibits the best performance with an average short-circuit current (Jsc) of 13.56 mA cmÀ2 and a fill factor (FF) of 59.23%, leading to a PCE of 6.02%
  • The external quantum efficiency (EQE) curves of champion poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) cells using CB:DIO and DCB:CIO as solvent are shown in PEDOT:PSS in real devices is ignored
结果
  • The initial test results indicated that the device with a 1:1.5 wt-ratio exhibits the best performance with an average short-circuit current (Jsc) of 13.56 mA cmÀ2 and a fill factor (FF) of 59.23%, leading to a PCE of 6.02%.
  • The performances of solar cells based on a PTB7/ PC71BM-blend film are further enhanced by using mixed solvent in preparing films.
  • 5.58 be effective in several polymer solar cell systems, including classical P3HT[12] as well as several high-efficiency low-bandgap polymers.[13] Preliminary study in the PTB7 system showed that the PTB7/PC71BM-blend film prepared from mixed solvent of dichlorobenzene (DCB)/1,8-diiodoctane (DIO) (97%:3% by volume) increases the fill factor from 60.25% to 68.9%.
  • This phenomenon indicates that the solvents affect the polymer packing.[14] Upon mixing of 3% DIO to the solvent, the solar cell Jsc of the resulting blend film was significantly increased to 14.5 mA cmÀ2.
  • The same procedure was conducted for the DCB:DIO device, the calculated Jsc value of 13.99 mA cmÀ2 is within
  • The external quantum efficiency (EQE) curves of champion poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) cells using CB:DIO and DCB:CIO as solvent are shown in PEDOT:PSS in real devices is ignored.
  • Efficiency in the range between 400 and 700 nm with EQE values and CB:DIO champion cells is shown is Figure 4c.
  • In the CB:DIO device, the maximum EQE is 68.1% at champion cell, the IQE spectrum shows a very high value of
结论
  • BHJ solar cells based on the blend films of PTB7 with PC71BM exhibited an efficiency up to
  • The photovoltaic property of PTB7 was studied in the ß 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.MaterialsViews.com structure of ITO/PEDOT:PSS/polymer (PC71BM)/Ca/Al. ITO-coated glass substrates (15 V &À1) were cleaned stepwise in detergent, water, acetone, and isopropyl alcohol under ultrasonication for 15 min each and subsequently dried in an oven for several hours.
总结
  • Sun is the largest carbon-neutral energy source that has not been fully utilized. there are solar cell devices based on inorganic semiconductor to efficiently harvest solar energy, the cost of these conventional devices is too high to be economically viable.
  • The resulting PTB7/PC71BM-blend film exhibits a strong absorption covering a range from 300 to about 800 nm.
  • The initial test results indicated that the device with a 1:1.5 wt-ratio exhibits the best performance with an average short-circuit current (Jsc) of 13.56 mA cmÀ2 and a fill factor (FF) of 59.23%, leading to a PCE of 6.02%.
  • The performances of solar cells based on a PTB7/ PC71BM-blend film are further enhanced by using mixed solvent in preparing films.
  • 5.58 be effective in several polymer solar cell systems, including classical P3HT[12] as well as several high-efficiency low-bandgap polymers.[13] Preliminary study in the PTB7 system showed that the PTB7/PC71BM-blend film prepared from mixed solvent of dichlorobenzene (DCB)/1,8-diiodoctane (DIO) (97%:3% by volume) increases the fill factor from 60.25% to 68.9%.
  • This phenomenon indicates that the solvents affect the polymer packing.[14] Upon mixing of 3% DIO to the solvent, the solar cell Jsc of the resulting blend film was significantly increased to 14.5 mA cmÀ2.
  • The same procedure was conducted for the DCB:DIO device, the calculated Jsc value of 13.99 mA cmÀ2 is within
  • The external quantum efficiency (EQE) curves of champion poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) cells using CB:DIO and DCB:CIO as solvent are shown in PEDOT:PSS in real devices is ignored.
  • Efficiency in the range between 400 and 700 nm with EQE values and CB:DIO champion cells is shown is Figure 4c.
  • In the CB:DIO device, the maximum EQE is 68.1% at champion cell, the IQE spectrum shows a very high value of
  • BHJ solar cells based on the blend films of PTB7 with PC71BM exhibited an efficiency up to
  • The photovoltaic property of PTB7 was studied in the ß 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.MaterialsViews.com structure of ITO/PEDOT:PSS/polymer (PC71BM)/Ca/Al. ITO-coated glass substrates (15 V &À1) were cleaned stepwise in detergent, water, acetone, and isopropyl alcohol under ultrasonication for 15 min each and subsequently dried in an oven for several hours.
表格
  • Table1: Photovoltaic parameters of devices with various PTB7/PC71BM weight ratios
  • Table2: Device photovoltaic parameters of (i) DCB only, (ii) DCB with 3% DIO, (iii) CB, and (iv) CB with 3% DIO as solvent(s). The Jsc calculated from EQE spectrum and the error between calculated (calc.) and measured Jsc is also shown
Download tables as Excel
基金
  • We acknowledge the supports from US National Science Foundation grant (DMR-703274, L
  • The work is also partially www.advmat.de supported by Solarmer Energy Inc
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