Tuning nanoscale morphology using mixed solvents and solvent vapor treatment for high performance polymer solar cells

Abstract

A series of high performance polymer solar cells (PSCs) were fabricated with poly[(4,8-bis-(2-ethylhexyloxy)-benzo[1,2-b:4,5-b′](dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno [3,4-b]thiophene)-2,6-diyl] (PBDTTT-EFT) as the donor and with [6,6]phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor.

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

“…2,3 An ideal D/A vertical phase separation in the active layers for obtaining high efficient PSCs has three features: (i) multiple D/A interfaces for efficient charge carrier generation; (ii) bicontinuous interpenetrated network for efficient charge carrier transfer; (iii) gradual distribution in the vertical direction with acceptor enriched near cathode for better charge carrier collection by individual electrodes. [6][7][8][9][10] Interfacial engineering also plays a critical role in improving the performance of PSCs by incorporating interfacial layer between the active layers and electrodes. [6][7][8][9][10] Interfacial engineering also plays a critical role in improving the performance of PSCs by incorporating interfacial layer between the active layers and electrodes.…”

High efficient ternary polymer solar cells based on absorption complementary materials as electron donor

“…The bulk heterojunction sandwiched by electrodes is commonly considered as an optimized structure due to the large interface area between donor and acceptor materials that ensures efficient photogenerated exciton dissociation into free charge carriers. Some smart strategies were carried out to adjust donor/ acceptor phase separation to form a bicontinuous interpenetrating network, such as annealing treatment, solvent treatment, solvent additive and mixed solvent [10][11][12][13]. To further increase the performance of PSCs, tandem configuration PSCs were designed with different band gap materials as the electron donors for the top and bottom sub-cells [14][15][16][17][18].…”

Revealing the effect of donor/acceptor intermolecular arrangement on organic solar cells performance based on two-dimensional conjugated small molecule as electron donor

“…The single bulk heterojunction layer sandwiched by electrodes has been demonstrated as a simple and effective device structure. It is known that the optimized phase separation of donor/acceptor (D/A) plays the key role in determining the exciton dissociation and charge carriers transport for obtaining high efficiency OSCs [6,7]. Small molecular photovoltaic materials have been considered as the potential candidates due to their advantages of facile synthesis, uniform batch-to-batch, high charge carrier mobility and great crystallinity [8][9][10].…”