Citation: Zhang Qiang, Liu Jiangang, Yu Xinhong, Han Yanchun. Design optimized intermixed phase by tuning polymer-fullerene intercalation for free charge generation[J]. Chinese Chemical Letters, ;2019, 30(7): 1405-1409. doi: 10.1016/j.cclet.2019.04.004 shu

Design optimized intermixed phase by tuning polymer-fullerene intercalation for free charge generation

Zhang Qiang ^a,b ,
Liu Jiangang ^a,*, ,
Yu Xinhong ^a ,
Han Yanchun ^a,*,

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of the Chinese Academy of Sciences, Beijing 100049, China

niitawh@ciac.ac.cn

ychan@ciac.ac.cn

Received Date: 27 January 2019
Revised Date: 11 March 2019
Accepted Date: 2 April 2019
Available Online: 3 July 2019

Figures(5)

The intermixed phase is important in effective charge separation due to the formation of cascaded energy landscape between intermixed phase and pure phases in polymer/fullerene solar cells. However, the quantitative relationship between the charge separation and the content of intermixed phase has not been investigated clearly so far. Here, we proposed to tune the content of the polymer/PC₇₁BM intermixed phase by changing the polymer solution conformation. Poly[2, 5-bis(3-tetradecylthiophen-2-yl)thieno[3, 2-b]thiophene] (PBTTT) and PC₇₁BM was selected as a model system. The organization of the PBTTT in solution promotes the formation of ordered aggregates as aging time increases, the interdigitation of side-chains restricts the intercalation of PC₇₁BM. Therefore, the intermixed phase formed by intercalation PC₇₁BM to PBTTT side chain can be controlled. When the aging time increasing from 0 to 80 min, the extent of intercalation gradually from almost complete intercalated phase to almost non-intercalated. As the content of intercalated phase is about 11%, the charge dissociation is most efficient and short circuit current (J_sc) increased from 1.60 mA/cm² to 4.94 mA/cm², leading to optimized device performance.
- Solution aging,
- Intercalation,
- Intermixed phase,
- Three-phase morphology,
- Polymer solar cell
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