Lifetime over 10000 hours for organic solar cells with Ir/IrOx electron-transporting layer

Abstract

The stability of organic solar cells is a key issue to promote practical applications. Herein, we demonstrate that the device performance of organic solar cells is enhanced by an Ir/IrOx electron-transporting layer, benefiting from its suitable work function and heterogeneous distribution of surface energy in nanoscale. Notably, the champion Ir/IrOx-based devices exhibit superior stabilities under shelf storing (T80 = 56696 h), thermal aging (T70 = 13920 h), and maximum power point tracking (T80 = 1058 h), compared to the ZnO-based devices. It can be attributed to the stable morphology of photoactive layer resulting from the optimized molecular distribution of the donor and acceptor and the absence of photocatalysis in the Ir/IrOx-based devices, which helps to maintain the improved charge extraction and inhibited charge recombination in the aged devices. This work provides a reliable and efficient electron-transporting material toward stable organic solar cells.

Construction of a P, N Co-Doped Nanocarbon-Embedded g-C3N4 Hollow Sphere Nanoreactor for the Efficient Photocatalytic Production of Hydrogen Peroxide

“…The smallest arc radius is found for P, N–C@CNHS (Figure b), which indicates the fastest transfer of photo-generated carriers. , Meanwhile, the Bode-phase plot was measured and is shown in Figure c. The electron lifetime (τ r ) tends to be relevant to the inverse of characteristic frequency peaks following eq . , Correspondingly, the more negative frequency peak indicates a faster electron transfer and lower carrier recombination rate of P, N–C@CNHS. Additionally, as shown in Figure d, all photocatalysts display good photo-response ability, and P, N–C@CNHS presents the highest photocurrent signal. τ normalr = 1 / ( 2 π f max ) where f max is set as the maximum frequency of a specific peak for the intermediate. E normalC normalB = E normalV normalB − E normalg normalO 2 + normalH + + 2 normale − → normalH 2 normalO 2 …”

“…The electron lifetime (τ r ) tends to be relevant to the inverse of characteristic frequency peaks following eq 3. 62,63 Correspondingly, the more negative frequency peak indicates a faster electron transfer and lower carrier recombination rate of P, N−C@CNHS. Additionally, as shown in Figure 4d, all photocatalysts display good photoresponse ability, and P, N−C@CNHS presents the highest photocurrent signal.…”

Highly Efficient and Stable Organic Solar Cells Enabled by a PEDOT:PSS/HxMoO3 Hybrid Hole Transport Layer

“…According to reports, PEDOT:PSS can improve its performance by acid treatment, and the H + ions contained in H x MoO 3 may also play the same role. Device stability is a key issue to promote practical applications. , Figure shows the normalized functions of the thermal stability of PCE, V oc , J sc , and FFfour parameters of different HTL devices exposed to an 85°C nitrogen environment under unpackaged conditions within 400 h, where HTL is PEDOT:PSS, H x MoO 3 , and hybrid HTL. The detailed data are recorded in Tables S4–S6.…”

Low‐Temperature Prepared ZnO Layer with Electron Beam Annealing Process for Enhancing the Environmental, Thermal, and Operational Stability of Organic Photovoltaics

“…For this reason, studies have been reported to improve efficiency and stability by applying ethoxylated polyethyleneimine chelated with Zn 2þ or iridium/ iridium oxide without using ZnO, but it is difficult to avoid the application of ZnO in terms of cost or ease of use. [45,46] In this study, defects were effectively decreased from the ZnO surface by electron beam annealing (EBA). EBA treatment can improve the physical properties of thin films in a relatively low temperature and short time compared to conventional thermal treatment.…”