A crosslinked fullerene matrix doped with an ionic fullerene as a cathodic buffer layer toward high-performance and thermally stable polymer and organic metallohalide perovskite solar cells

Abstract

In this study, we developed a new cathodic buffer layer consisting of a cross -linked [6,6]phenyl-C 61 -butyric styryl dendron ester (C-PCBSD) matrix and an ionic FPI dopant. The incorporation of FPI can improve the electron mobility via an anion induced charge transfer (AIET) mechanism while maintaining the solvent-resistant property of the crosslinked layer. The ZnO combined with C-PCBSD/FPI layer can effectively and universally improve the performance of bulk-heterojunction polymer solar cells (BHJPSCs), planar heterojunction polymer solar cells (PHJPSCs), and organic metallohalide perovskite solar cells (OMPSCs). Furthermore, the insertion of C-PCBSD/FPI layer can improve the thermal stability of the device by preventing the residue moisture in ZnO from diffusing into the CH 3 NH 3 PbI 3 layer in OMPSCs.

A chlorinated nonacyclic carbazole-based acceptor affords over 15% efficiency in organic solar cells

“…† is capable of affording extra exciton dissociation and better J SC performance as observed in literature precedents. 11,31,32,35 The current density vs. voltage (J-V) curves of PM6:DTC-4F, PM6:DTTC-4F and PM6:DTTC-4Cl are shown in Fig. 4(b) whereas the photovoltaic parameters are summarized in Table 2.…”

“…Our previous efforts have created numerous fused-ring structures and interfacial materials through molecular design. 8,11,22,[29][30][31][32][33][34][35][36] Very recently, DTC-4F (previously named DTC(4Ph)-4FIC) afforded a decent PCE of 13.36% with a V OC of 0.94 V, a J SC of 20.20 mA cm À2 and a FF of 70.42%. 11 As observed in Fig.…”

Chlorinated Carbon‐Bridged and Silicon‐Bridged Carbazole‐Based Nonfullerene Acceptors Manifest Synergistic Enhancement in Ternary Organic Solar Cell with Efficiency over 15%

“…The C‐PCBSD CIL reportedly provides a hydrophobic surface that hinders erosion from moisture and acid, thus affording a fine ZnO layer and facilitating electron transport with increased mobility. [ 59–64 ] The J – V characteristics and EQE spectra of BHJ‐OSC devices containing T1:DTCC‐4Cl, T1:DTSiC‐4Cl, and T1:DTSiC‐4Cl:DTCC‐4Cl (1:1:0.4) in the modified inverted structure are shown in Figure c,d. The modified T1:DTCC‐4Cl‐based devices exhibited a moderate PCE of 14.43% with a V OC of 0.94 V, a J SC of 20.03 mA cm −2 , and an FF of 76.26%.…”

Functionalized Amphiphilic Diblock Fullerene Derivatives as a Cathode Buffer Layer for Efficient Inverted Organic Solar Cells

“…Based on the characteristic of low work function, zinc oxide (ZnO) was always used as a buffer layer to decrease the barrier of the cathode electrode with an ohmic contact in inverted OSCs. − However, the trap sites and defects of ZnO always required an amphiphilic interface material to be introduced between ZnO and the active layer to get an efficient device. − The most commonly used interface material to modify ZnO was the amphiphilic organic material, especially the functionalized amphiphilic fullerene derivatives. − Amphiphilic fullerene derivatives functionalized with polar groups can be regarded as hydrophobic–hydrophilic diblock molecular, in which fullerene and polar groups were the hydrophobic and hydrophilic blocks, respectively. − The introduced amphiphilic diblock fullerene derivative layer can also guarantee the improvement of interface compatibility when introducing to modify ZnO in OSC devices. − …”