Ternary strategy enabling high-efficiency rigid and flexible organic solar cells with reduced non-radiative voltage loss

Abstract

Ternary strategy has been identified as a feasible and effective way to obtain high-efficiency organic solar cells (OSCs). However, for most ternary OSCs, the voltage loss (Vloss) lies between those...

Single‐Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor

“…The decay profiles with different excitation fluence are shown in Figure 1d–f, and the related parameters are summarized in Table S2 in the Supporting Information. Consequently, the calculated L D ( L D = ( Dτ ) 1/2 , [ 28,31 ] where D is the diffusion coefficient factor and τ is the corresponding exciton lifetime) values are 4.98 nm for L8‐BO, 6.33 nm for L8‐BO:BTP‐2F2Cl and 7.03 nm for BTP‐2F2Cl, respectively. Thus, the photo‐induced exciton in the alloy acceptor phase can diffuse to a longer distance within the effective exciton lifetime compared to the L8‐BO film.…”

“…[ 24–26 ] Several rational selection criteria for the appropriate guest materials should be considered: 1) the guest component can possess complementary absorption with the host binary to improve the total light‐harvesting spectrum and photocurrent generation of the active layer. [ 21,23,27,28 ] 2) the introduced guest component should have good compatibility with the D or A in the host binary to form a suitable BHJ microstructure for effective photoelectric conversion. [ 29,30 ] 3) the guest component can delicately modify the energetics of the binary system for reduced E loss [ 31 ] or realize the energy cascade alignment formation for efficient exciton dissociation and charge transfer.…”

Revealing the Sole Impact of Acceptor's Molecular Conformation to Energy Loss and Device Performance of Organic Solar Cells through Positional Isomers

“…Meanwhile, the ternary devices have a much lower nonradiative recombination loss than that of the binary system, this phenomenon could be attributed to the ternary blend has a lower density of trap states. [72] Obviously, the lower voltage loss benefits the V OC of devices. The carrier dynamics were performed to investigate the difference on V loss .…”

Realizing the efficiency-stability balance for all-polymer photovoltaic blends

“…[1][2][3][4][5][6][7][8][9][10][11][12] However, even though the record power conversion efficiency (PCE) has been pushed to a high level for both single-junction and tandem devices by researchers, its stability still causes the ''short board effect'', reducing users' confidence in this technology's commercialization prospects. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Therefore, the urgent issue to be solved, is the stability, or achieving the performance-stability balance for OSCs.…”