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Ternary organic solar cells with enhanced open circuit voltage

Chuanfei Wang ; Xiaofeng Xu (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Wei Zhang ; Sadok Ben Dkhil ; Xiangyi Meng ; Xianjie Liu ; Olivier Margeat ; Arkady Yartsev ; Wei Ma ; Jörg Ackermann ; Ergang Wang (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Mats Fahlman
Nano Energy (22112855). Vol. 37 (2017), p. 24-31.
[Artikel, refereegranskad vetenskaplig]

By introducing a non-fullerene small molecule acceptor as a third component to typical polymer donor: fullerene acceptor binary solar cells, we demonstrate that the short circuit current density (Jsc), open circuit voltage (Voc), power conversion efficiency (PCE) and thermal stability can be enhanced simultaneously. The different surface energy of each component causes most of the non-fullerene acceptor molecules to self-organize at the polymer/fullerene interface, while the appropriately selected oxidation/reduction potential of the non-fullerene acceptor enables the resulting ternary junction to work through a cascade mechanism. The cascade ternary junction enhances charge generation through complementary absorption between the non-fullerene and fullerene acceptors and aids the efficient charge extraction from fullerene domains. The bimolecular recombination in the ternary blend layer is reduced as the ternary cascade junction increases the separation of holes and electrons during charge transportation and the trap assistant recombination induced by integer charge transfer (ICT) state potentially reduced due to the smaller pinning energy of inserted non-fullerene acceptor, leading to an unprecedented increase in the open circuit voltage beyond the binary reference values.

Nyckelord: Generality; Higher open circuit voltage; More thermal stable; Self-organization; Ternary organic solar cell



Denna post skapades 2017-06-14. Senast ändrad 2017-07-14.
CPL Pubid: 249845

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur