Improving Performance of All-Polymer Solar Cells Through Backbone Engineering of Both Donors and Acceptors
Artikel i vetenskaplig tidskrift, 2018

All-polymer solar cells (APSCs), composed of semiconducting donor and acceptor polymers, have attracted considerable attention due to their unique advantages compared to polymer-fullerene-based devices in terms of enhanced light absorption and morphological stability. To improve the performance of APSCs, the morphology of the active layer must be optimized. By employing a random copolymerization strategy to control the regularity of the backbone of the donor polymers (PTAZ-TPDx) and acceptor polymers (PNDI-Tx) the morphology can be systematically optimized by tuning the polymer packing and crystallinity. To minimize effects of molecular weight, both donor and acceptor polymers have number-average molecular weights in narrow ranges. Experimental and coarse-grained modeling results disclose that systematic backbone engineering greatly affects the polymer crystallinity and ultimately the phase separation and morphology of the all-polymer blends. Decreasing the backbone regularity of either the donor or the acceptor polymer reduces the local crystallinity of the individual phase in blend films, affording reduced short-circuit current densities and fill factors. This two-dimensional crystallinity optimization strategy locates a PCE maximum at highest crystallinity for both donor and acceptor polymers. Overall, this study demonstrates that proper control of both donor and acceptor polymer crystallinity simultaneously is essential to optimize APSC performance.

morphology

device performance

crystallinity

all-polymer solar cells

Författare

Chunhui Duan

South China University of Technology

Technische Universiteit Eindhoven

Zhaojun Li

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Shuting Pang

South China University of Technology

You-Liang Zhu

Chinese Academy of Sciences

Baojun Lin

Xi'an Jiaotong University

Fallon J. M. Colberts

Technische Universiteit Eindhoven

Pieter J. Leenaers

Technische Universiteit Eindhoven

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Zhao-Yan Sun

Chinese Academy of Sciences

Wei Ma

Xi'an Jiaotong University

Stefan C. J. Meskers

Technische Universiteit Eindhoven

Rene A. J. Janssen

Technische Universiteit Eindhoven

Dutch Institute for Fundamental Energy Research

SOLAR RRL

2367-198X (ISSN)

Vol. 2 12

Ämneskategorier

Polymerkemi

Polymerteknologi

Textil-, gummi- och polymermaterial

DOI

10.1002/solr.201800247

Mer information

Senast uppdaterat

2019-01-16