11.4% Efficiency non-fullerene polymer solar cells with trialkylsilyl substituted 2D-conjugated polymer as donor | Zendy

Haijun Bin | Zendy; Liang Gao | Zendy; Zhiguo Zhang | Zendy; Yankang Yang | Zendy; Yindong Zhang | Zendy; Chunfeng Zhang | Zendy; Shanshan Chen | Zendy; LingWei Xue | Zendy; Changduk Yang | Zendy; Min Xiao | Zendy; Yongfang Li | Zendy

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11.4% Efficiency non-fullerene polymer solar cells with trialkylsilyl substituted 2D-conjugated polymer as donor

Author(s) -

Haijun Bin,

Liang Gao,

Zhiguo Zhang,

Yankang Yang,

Yindong Zhang,

Chunfeng Zhang,

Shanshan Chen,

LingWei Xue,

Changduk Yang,

Min Xiao,

Yongfang Li

Publication year - 2016

Publication title -

nature communications

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.559

H-Index - 365

ISSN - 2041-1723

DOI - 10.1038/ncomms13651

Subject(s) - conjugated system , acceptor , polymer , energy conversion efficiency , fullerene , open circuit voltage , materials science , polymer solar cell , homo/lumo , organic solar cell , short circuit , photovoltaic system , photochemistry , optoelectronics , voltage , chemistry , molecule , organic chemistry , physics , condensed matter physics , ecology , quantum mechanics , composite material , biology

Simutaneously high open circuit voltage and high short circuit current density is a big challenge for achieving high efficiency polymer solar cells due to the excitonic nature of organic semdonductors. Herein, we developed a trialkylsilyl substituted 2D-conjugated polymer with the highest occupied molecular orbital level down-shifted by Si–C bond interaction. The polymer solar cells obtained by pairing this polymer with a non-fullerene acceptor demonstrated a high power conversion efficiency of 11.41% with both high open circuit voltage of 0.94 V and high short circuit current density of 17.32 mA cm −2 benefitted from the complementary absorption of the donor and acceptor, and the high hole transfer efficiency from acceptor to donor although the highest occupied molecular orbital level difference between the donor and acceptor is only 0.11 eV. The results indicate that the alkylsilyl substitution is an effective way in designing high performance conjugated polymer photovoltaic materials.

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