Design and Synthesis of Copolymers of Indacenodithiophene and Naphtho[1,2-<i>c</i>:5,6-<i>c</i>]bis(1,2,5-thiadiazole) for Polymer Solar Cells

Wang, Ming; Hu, Xiaowen; Liu, Liqian; Duan, Chunhui; Liu, Peng; Ying, Lei; Huang, Fei; Cao, Yong

doi:10.1021/ma400355w

Cited by 69 publications

(50 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[ 32 ] In most reported cases, the band gaps of conjugated polymers are reduced by incorporating additional thienyl units between the donor and the acceptor segments because of the resulting increases in the extension and delocalization of the π-electron system. [ 33 ] Note that similar results are evident when the thienyl units are added to the BDT units as side chains in this systems.…”

Section: Wileyonlinelibrarycomsupporting

confidence: 70%

Side‐Chain Engineering for Fine‐Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

Lee

Kim

Kang

et al. 2014

Advanced Energy Materials

View full text Add to dashboard Cite

These specifi c design criteria promote high values of the short-circuit current ( J sc ), the open-circuit voltage ( V oc ), and the fi ll factor (FF) of PSCs, which are all related to the PCE. Therefore, tremendous effort has been devoted to optimizing these key parameters by developing new molecular structures and consequently several design rules have been proposed so far. [ 10 ] The side chains are important to ensure enough solubility of the resulting polymers for applications in solutionprocessable organic electronics. In addition to securing solubility, side chains play a multifunctional role in modulating the molecular weight, the optoelectronic properties, and the BHJ fi lm morphology, which all have a signifi cant impact on the performance of PSCs. [11][12][13][14][15][16][17] Thus, side chains should be carefully selected in order to improve the PCE. Despite their signifi cance, however, the exploration of the side chains of conjugated polymers has largely been overlooked until recently, in comparison with the extensive effort focused on developing new designs for their conjugated backbones. [18][19][20] Moreover, although a few studies have recently reported on the effects of side chains, these have not provided enough guidelines for other polymer systems. Therefore, systematic investigations are required to provide a comprehensive understanding of the correlations between the side chains of conjugated polymers and their photovoltaic performances for the further development of new materials and the improvement of PSC effi ciency.Here, we report the strategic side-chain engineering of lowbandgap polymers based on benzodithiophene-difl uorobenzothiadiazole (BDT-2FBT) copolymer system with the aim of achieving highly effi cient PSCs. By incorporating a series of functionalized side chains alkyl-, alkoxy-, alkylthienyl-, and alkoxythienyl chains into these copolymers, we investigated how the molecular tuning of side chains infl uences the key parameters determining the PCEs. Although several studies have been reported concerning the comparison between alkoxy-and alkylthienyl side chains, [ 7,8 ] there is no report on the simultaneous investigation into alkyl-, alkoxy-, alkylthienyl-, and alkoxythienyl chains with identical conjugated backbone. Furthermore, PBDT2FBT-T-O, which has the alkoxythienyl side chains appended on BDT moiety, has not been reported

show abstract

Section: Wileyonlinelibrarycomsupporting

confidence: 70%

Side‐Chain Engineering for Fine‐Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

Lee

Kim

Kang

et al. 2014

Advanced Energy Materials

View full text Add to dashboard Cite

show abstract

“…were prepared according to the reported procedures. [31,36] All chemicals and reagents were purchased from commercial sources (Aldrich, Acros, and Alfa Aesar) and used without further purification unless stated otherwise.…”

Section: Discussionmentioning

confidence: 99%

Polymer Solar Cells Based on the Copolymers of Naphtho[1,2‐c:5,6‐c]bis(1,2,5‐thiadiazole) and Alkoxylphenyl Substituted Benzodithiophene with High Open‐Circuit Voltages

Liu

Zhang

et al. 2015

Chin. J. Chem.

Self Cite

View full text Add to dashboard Cite

Two novel naphtho [1,2-c:5,6-c]bis(1,2,5-thiadiazole) and alkoxylphenyl substituted benzodithiophene based copolymers were developed as the donor materials for polymer solar cells. The resulting copolymers exhibit broad absorption bands in the range of 500-800 nm in thin films and deep highest occupied molecular orbital energy levels of −5.39 eV and −5.36 eV, respectively. The best device performance was achieved by P1, with an open-circuit voltage of 0.85 V, a short-circuit current density of 8.65 mA•cm −2 , a fill factor of 37.8%, and a power conversion efficiency of 2.78%.

show abstract

“…However, the E g opt of the former was larger than that of the later, which could be attributed to the different aggregation structure of these two polymers films. Usually, the E g opt of a conjugated polymer decreases with the increase of the molecular stacking in film [31,35]. For example, the E g opt of the polymer P3 (1.70 eV) is largely smaller than its E g ec (2.11 eV) [36].…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Synthesis and property characterization of two novel side-chain isoindigo copolymers for polymer solar cells

Liu¹,

Wu²,

Guo³

et al. 2015

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Two novel side-chain conjugated polymers, PTBT-TID and PTBT-TTID, based on the new synthetic thiophene-benzne-thiophene (TBT) unit, side-chain isoindigo (ID) unit, and the introduced thiophene !-bridge, have been designed and synthesized. The photophysical, electrochemical and photovoltaic properties of the two polymers have been systematically investigated. The two polymers possess relatively good solubility as well as excellent thermal stability up to 380°C, and all of the polymer solar cell (PSC) devices based on the two polymers obtain high open circuit voltage (V oc ) of about 0.8 V. The polymer solar cells based on the polymer PTBT-TID show relatively higher efficiencies than the PTBT-TTID-based ones, due to the broader absorption spectrum, a relatively higher hole mobility, a lower HOMO (the highest occupied molecular orbital) energy level, a stronger IPCE (the incident photon to current conversion efficiency) response and a better microphase separation, Consequently, the device based on PTBT-TID:PC 61 BM (1:2, by weight) gives the best power conversion efficiency (PCE) of 2.04%, with a short-circuit current density (J sc ) of 5.39 mA·cm -2 , an open-circuit voltage (V oc ) of 0.83 V, and a fill factor (FF) of 0.45.

show abstract

Design and Synthesis of Copolymers of Indacenodithiophene and Naphtho[1,2-c:5,6-c]bis(1,2,5-thiadiazole) for Polymer Solar Cells

Cited by 69 publications

References 60 publications

Side‐Chain Engineering for Fine‐Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

Side‐Chain Engineering for Fine‐Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

Polymer Solar Cells Based on the Copolymers of Naphtho[1,2‐c:5,6‐c]bis(1,2,5‐thiadiazole) and Alkoxylphenyl Substituted Benzodithiophene with High Open‐Circuit Voltages

Synthesis and property characterization of two novel side-chain isoindigo copolymers for polymer solar cells

Contact Info

Product

Resources

About