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Structure-Property Relationships of Oligothiophene-Isoindigo Polymers for Efficient Bulk-Heterojunction Solar Cells

Zaifei Ma ; Wenjun Sun (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Scott Himmelberger ; Koen Vandewal ; Zheng Tang ; Jonas Bergqvist ; Alberto Salleo ; Jens Wenzel Andreasen ; Olle Inganas ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Christian Müller (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Fengling Zhang ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi)
Energy & Environmental Science (1754-5692). Vol. 7 (2014), 1, p. 361-369.
[Artikel, refereegranskad vetenskaplig]

A series of alternating oligothiophene (nT)–isoindigo (I) copolymers (PnTI) were synthesized to investigate the influence of the oligothiophene block length on the photovoltaic (PV) properties of PnTI:PCBM bulk-heterojunction blends. Our study indicates that the number of thiophene rings (n) in the repeating unit alters both polymer crystallinity and polymer–fullerene interfacial energetics, which results in a decreasing open-circuit voltage (Voc) of the solar cells with increasing n. The short-circuit current density (Jsc) of P1TI:PCBM devices is limited by the absence of a significant driving force for electron transfer. Instead, blends based on P5TI and P6TI feature large polymer domains, which limit charge generation and thus Jsc. The best PV performance with a power conversion efficiency of up to 6.9% was achieved with devices based on P3TI, where a combination of a favorable morphology and an optimal interfacial energy level offset ensures efficient exciton separation and charge generation. The structure–property relationship demonstrated in this work would be a valuable guideline for the design of high performance polymers with small energy losses during the charge generation process, allowing for the fabrication of efficient solar cells that combine a minimal loss in Voc with a high Jsc.



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Denna post skapades 2013-10-18. Senast ändrad 2016-11-08.
CPL Pubid: 185390

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Hållbar utveckling
Kemi
Materialkemi
Polymerkemi
Kemiteknik
Materialteknik
Energisystem
Nanoteknik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)