Tailored Donor-Acceptor Polymers with an A-D1-A-D2 Structure: Controlling Intermolecular Interactions to Enable Enhanced Polymer Photovoltaic Devices

被引:182
作者
Qin, Tianshi [1 ]
Zajaczkowski, Wojciech [2 ]
Pisula, Wojciech [2 ]
Baumgarten, Martin [2 ]
Chen, Ming [1 ]
Gao, Mei [1 ]
Wilson, Gerry [1 ]
Easton, Christopher D. [1 ]
Muellen, Klaus [2 ]
Watkins, Scott E. [1 ]
机构
[1] CSIRO Mat Sci & Engn, Ian Wark Lab, Clayton, Vic 3169, Australia
[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
关键词
LOW-BANDGAP POLYMERS; OPEN-CIRCUIT VOLTAGE; SOLAR-CELLS; CONJUGATED POLYMER; TANDEM POLYMER; SIDE-CHAINS; PERFORMANCE; EFFICIENCY; COPOLYMER; BENZODITHIOPHENE;
D O I
10.1021/ja500935d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Extensive efforts have been made to develop novel conjugated polymers that give improved performance in organic photovoltaic devices. The use of polymers based on alternating electron-donating and electron-accepting units not only allows the frontier molecular orbitals to be tuned to maximize the open-circuit voltage of the devices but also controls the optical band gap to increase the number of photons absorbed and thus modifies the other critical device parameter the short circuit current. In fact, varying the nonchromophoric components of a polymer is often secondary to the efforts to adjust the intermolecular aggregates and improve the charge-carrier mobility. Here, we introduce an approach to polymer synthesis that facilitates simultaneous control over both the structural and electronic properties of the polymers. Through the use of a tailored multicomponent acceptor donor acceptor (A-D-A) intermediate, polymers with the unique structure A-D1-A-D2 can be prepared. This approach enables variations in the donor fragment substituents such that control over both the polymer regiochemistry and solubility is possible. This control results in improved intermolecular it-stacking interactions and therefore enhanced charge-carrier mobility. Solar cells using the A-D1-A-D2 structural polymer show short-circuit current densities that are twice that of the simple, random analogue while still maintaining an identical open-circuit voltage. The key finding of this work is that polymers with an A-D1-A-D2 structure offer significant performance benefits over both regioregular and random A-D polymers. The chemical synthesis approach that enables the preparation of A-D1-A-D2 polymers therefore represents a promising new route to materials for high-efficiency organic photovoltaic devices.
引用
收藏
页码:6049 / 6055
页数:7
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