Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends

被引：56

作者：

Koentges, Wolfgang ^{[1
]}

Perkhun, Pavlo ^{[2
]}

Kammerer, Jochen ^{[1
,3
]}

Alkarsifi, Riva ^{[2
]}

Wuerfel, Uli ^{[4
,5
]}

Margeat, Olivier ^{[2
]}

Videlot-Ackermann, Christine ^{[2
]}

Simon, Jean-Jacques ^{[6
]}

Schroeder, Rasmus R. ^{[1
,3
,7
,8
]}

Ackermann, Jorg ^{[2
]}

Pfannmoeller, Martin ^{[1
]}

机构：

[1] Heidelberg Univ, CAM, Heidelberg, Germany

[2] Aix Marseille Univ, CNRS, CINaM, Marseille, France

[3] Heidelberg Univ, Cluster Excellence EXC 2082 1 390761711, 3DMM2O, Heidelberg, Germany

[4] Fraunhofer Inst Solar Energy Syst ISE, Freiburg, Germany

[5] Univ Freiburg, Freiburg Mat Res Ctr FMF, Freiburg, Germany

[6] Aix Marseille Univ, Univ Toulon, CNRS, IM2NP, Marseille, France

[7] Heidelberg Univ, Univ Hosp Heidelberg, Cluster Excellence EXC 2082 1 390761711, 3DMM20, Heidelberg, Germany

[8] Heidelberg Univ, Univ Hosp Heidelberg, BioQuant, Heidelberg, Germany

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2020年 / 13卷 / 04期

关键词：

POLYMER SOLAR-CELLS; CHARGE SEPARATION; ELECTRON-ACCEPTOR; SOLVENT; ENERGY; PHOTOVOLTAICS; STATES; FILMS;

D O I：

10.1039/c9ee03535d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The efficiency of organic solar cells with donor polymers and non-fullerene acceptors depends on a complex morphology. Similar chemical and electronic structures impede generating in-depth insights in morphological details. We visualise molecular arrangements and the nanomorphology in PBDB-T:ITIC blends by correlating transmission electron micrographs and material distribution maps. Material phases are identified by machine learning on hyperspectral data from electron spectroscopic imaging. We observe a specific polymorph of ITIC after thermal annealing. During annealing, enhanced by the presence of additives, PBDB-T acts as nucleation site for ITIC due to strong pi-pi-interactions of the electron withdrawing groups of both molecules. This leads to efficient charge transport paths in ITIC phases with direct pi-pi-contact to PBDB-T at the interface. We conclude that pi-pi-stacking between donor and acceptor molecules facilitates charge carrier generation within mixed interface regions.

引用

页码：1259 / 1268

页数：10

共 44 条

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