Achieving over 18 % Efficiency Organic Solar Cell Enabled by a ZnO‐Based Hybrid Electron Transport Layer with an Operational Lifetime up to 5 Years

Abstract

Although organic solar cells (OSCs) have delivered an impressive power conversion efficiency (PCE) of over 19 %, most of them demonstrated rather limited stability. So far, there are hardly any effective and universal strategies to improve stability of state-ofthe-art OSCs. Herein, we developed a hybrid electrontransport layer (ETL) in inverted OSCs using ZnO and a new modifying agent (NMA), and significantly improved the stability and PCEs for all the tested devices. In particular, when applied in the D18 : N3 system, its inverted OSC exhibits so far the highest PCE (18.20 %) among inverted single-junction OSCs, demonstrating an extrapolated T 80 lifetime of 7572 h (equivalent to 5 years under outdoor exposure). This is the first report with T 80 over 5000 h among OSCs with over 18 % PCE. Furthermore, a high PCE of 16.12 % can be realized even in a large-area device (1 cm 2 ). This hybrid ETL strategy provides a strong stimulus for highly prospective commercialization of OSCs.

In Situ Doping of the PEDOT Top Electrode for All-Solution-Processed Semitransparent Organic Solar Cells

“…We employed time-of-flight secondary ion mass spectrometry (ToF-SIMS) to directly investigate the dopant dispersion within the device stack. The intact ion fragment species of C 6 H 5 O 2 S – (PEDOT), C 8 H 7 SO 3 – (PSS), C 8 F 17 SO 3 – (F-acid), CN – (D18:Y6), and ZnO 2 – (ZnO) were analyzed to determine their vertical distribution. Both sets of 3D images in Figure D,E exhibit distinct separation between each layer, indicating that each process ink successfully achieved solvent orthogonality.…”

Revisiting the Bithiophene Imide‐Based Polymer Donors: Molecular Aggregation and Orientation Control Enabling New Polymer Donors for High‐Performance All‐Polymer Solar Cells†

“…V eff is given by V eff = V 0 – V bis , in which V 0 is the voltage under which J ph is zero and V bis is the exerted voltage bias, respectively. [ 29 ] The charge collection probability ( P c ) is given by P c = J ph / J sat , in which J ph is photocurrent densities at short‐circuit condition and J sat is the saturated photocurrent densities. As shown in Table S3, the P c s of G3 and G15‐based devices are computed to be 76.22% and 97.43%, respectively.…”

Path to the fabrication of efficient, stable and commercially viable large-area organic solar cells

“…This suggests that PEDOT:PSS works as an effective interlayer to improve the photostability of the OPV module. Furthermore, Li et el employed a new organic molecule consisting of carboxylic acid at one end, whose function is to deactivate photoinduced catalysis of the ZnO, and called this new organic molecule as new modifying agent (NMA) [100]. Using D18:N3 as the active layer and adopting hybrid ZnO/NMA ETL to fabricate a 1 cm 2 area OSC could achieve 16.12% PCE.…”