High Performance All-Polymer Solar Cells by Synergistic Effects of Fine-Tuned Crystallinity and Solvent Annealing

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Growing interests have been devoted to the design of polymer acceptors as potential replacement for fullerene derivatives for high-performance all polymer solar cells (all-PSCs). One key factor that is limiting the efficiency of all-PSCs is the low fill factor (FF) (normally <0.65), which is strongly correlated with the mobility and film morphology of polymer:polymer blends. In this work, we find a facile method to modulate the crystallinity of the well-known naphthalene diimide (NDI) based polymer N2200, by replacing a certain amount of bithiophene (2T) units in the N2200 backbone by single thiophene (T) units and synthesizing a series of random polymers PNDI-Tx, where x is the percentage of the single T. The acceptor PNDI-T10 is properly miscible with the low band gap donor polymer PTB7-Th, and the nanostructured blend promotes efficient exciton dissociation and charge transport. Solvent annealing (SA) enables higher hole and electron mobilities, and further suppresses the bimolecular recombination. As expected, the PTB7-Th:PNDI-T10 solar cells attain a high PCE of 7.6%, which is a 2-fold increase compared to that of PTB7-Th:N2200 solar cells. The FF of 0.71 reaches the highest value among all-PSCs to date. Our work demonstrates a rational design for fine-tuned crystallinity of polymer acceptors, and reveals the high potential of all-PSCs through structure and morphology engineering of semicrystalline polymer:polymer blends.

Detaljer

Författare
  • Zhaojun Li
  • Xiaofeng Xu
  • Wei Zhang
  • Xiangyi Meng
  • Wei Ma
  • Arkady Yartsev
  • Olle Inganäs
  • Mats R. Andersson
  • René A J Janssen
  • Ergang Wang
Enheter & grupper
Externa organisationer
  • Chalmers University of Technology
  • Xi'an Jiaotong University
  • Linköping University
  • University of South Australia
  • Eindhoven University of Technology
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Polymerkemi
Originalspråkengelska
Sidor (från-till)10935-10944
Antal sidor10
TidskriftJournal of the American Chemical Society
Volym138
Utgivningsnummer34
StatusPublished - 2016 aug 31
PublikationskategoriForskning
Peer review utfördJa