Self-doping n-type polymer as cathode interface layer enables efficient organic solar cells

Unraveling the origin of improved photovoltaic performance in acceptor–acceptor-structured perylene-diimide-based polymeric acceptors through partially fluorinating benzo[c][1,2,5]thiadiazole

“…These morphological features tallied with the enhanced aggregation in 2D-GIWAXS analysis and reduced miscibility when blending with PTB7-Th, and in turn contributed to the improved device performance. 73–75…”

“…These morphological features tallied with the enhanced aggregation in 2D-GIWAXS analysis and reduced miscibility when blending with PTB7-Th, and in turn contributed to the improved device performance. [73][74][75] The miscibility and molecular interaction between polymeric acceptors PPDI-DTBT, PPDI-DTFBT and PTB7-Th were analyzed by comparing the Flory-Huggins interaction parameter (w D-A = (g D 0.5 À g A 0.5 ) 2 ) obtained from the contact angle (y) tests of pure films according to the two-solvent method utilizing water and ethylene glycol (EG). 71,76,77 The related contact angle measurements are shown in Fig.…”

Efficient ternary organic photovoltaic device with a non-halogenated solvent via synergistic inhibiting charge recombination and regulating morphology

“…Over the past few decades, organic photovoltaic (OPV) devices 1 have attracted significant attention from researchers due to their unique advantages of being light weight, low cost, easy to process, and flexible. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Typically, the active layer of OPV devices consists of a donor (D) material and an acceptor (A) material, resulting in a narrow absorption spectrum that is difficult to match with sunlight. [17][18][19][20][21][22][23][24][25][26] Therefore, ternary OPV devices have been developed as a simple and efficient means of improving the performance of OPV devices, through optimizing the active layer morphology and balancing the hole/electron transport.…”

Machine learning assisted identification of the matched energy level of materials for high open circuit voltage in binary organic solar cells

“…[13][14][15] At the same time, some studies also show that the interface modification methods, including adjusting the work functions of the hole/electron transport layer, can also effectively optimize the V oc in OSCs. [16][17][18] However, the relationship between numerous influencing factors and V oc is still unknown. Therefore, a mathematically oriented learning model becomes an urgent need for constructing a simulation algorithm to further understand the dominant influencing factors of V oc .…”