Open-Circuit Voltage Modulations on All-Polymer Solar Cells by Side Chain Engineering on 4,8-Di(thiophen-2-yl)benzo[1,2- b:4,5- b′]dithiophene-Based Donor Polymers
Journal article, 2018

In recent years, all-polymer solar cells (all-PSCs), incorporating active layers based on blends of electron-donor (D) and acceptor (A) polymers, have drawn attention because of the advantages they hold in the flexibility of choosing the D:A combinations to modulate their energy levels and to improve their overall open-circuit voltages (V oc ) and power conversion efficiencies (PCE)s. V oc is one of the key parameters for the determination of the PCEs of PSCs. In this work, we synthesized six donor polymers with three different side chains appended to the 4,8-di(thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDT) units. By substituting carbon with sulfur and silicon atoms at the 5-position of the thiophenes attached to the BDT units, the highest occupied molecular orbital (HOMO) levels of the donor polymers could be successfully lowered. As anticipated, the V oc values of the resulting all-PSCs increased along with the lowering of the HOMO levels of the donor polymers. Among the six all-PSCs, the PBDT-BDD:PNDI-T10 all-PSC realized a balance between the photovoltage and photocurrent, where a decent PCE of 5.6% was obtained with a V oc of 0.9 V and a photocurrent of 10.5 mA/cm 2 .

all-polymer solar cells

4,8-di(thiophen-2-yl)benzo[1,2- b:4,5- b′]dithiophene

organic photovoltaics

donor polymers

side chain engineering

acceptor polymers

open-circuit voltage

Author

Birhan Alkadir Abdulahi

Chalmers, Chemistry and Chemical Engineering

Addis Ababa University

Xiaofeng Xu

Linköping University

Petri Henrik Murto

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

O.W. Inganäs

Linköping University

W. Mammo

Addis Ababa University

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

ACS Applied Energy Materials

25740962 (eISSN)

Vol. 1 6 2918-2926

Design and synthesis of n-type polymers/oligomers for all-polymer solar cells and photodetectors

European Commission (FP7), 2013-10-01 -- 2017-09-30.

Organic Semiconductors for NIR Optoelectronics (OSNIRO)

European Commission (FP7), 2013-10-01 -- 2017-09-30.

Subject Categories

Polymer Chemistry

Other Earth and Related Environmental Sciences

Polymer Technologies

Areas of Advance

Energy

DOI

10.1021/acsaem.8b00562

More information

Latest update

6/26/2019