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
Artikel i vetenskaplig tidskrift, 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 .

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

open-circuit voltage

donor polymers

side chain engineering

all-polymer solar cells

acceptor polymers

organic photovoltaics


Birhan Alkadir Abdulahi

Addis Ababa University

Chalmers, Kemi och kemiteknik

Xiaofeng Xu

Linköpings universitet

Petri Henrik Murto

Chalmers, Kemi och kemiteknik, Tillämpad kemi

O.W. Inganäs

Linköpings universitet

W. Mammo

Addis Ababa University

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi

ACS Applied Energy Materials

25740962 (eISSN)

Vol. 1 6 2918-2926

Organic Semiconductors for NIR Optoelectronics (OSNIRO)

Europeiska kommissionen (EU) (EC/FP7/607585), 2013-10-01 -- 2017-09-30.

Design och syntes av polymerer / oligomerer av n-typ för all-polymer-solceller och fotodetektorer

Europeiska kommissionen (EU) (EC/H2020/607585), 2013-10-01 -- 2017-09-30.



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