In Situ Graded Passivation via Porphyrin Derivative with Enhanced Photovoltage and Fill Factor in Perovskite Solar Cells

Abstract

While perovskite solar cells (PSCs) have recently experienced a rapid rise in power conversion efficiency (PCE), the prevailing PSCs still contain nondesirable defects in the interior and interface of the perovskite layer, which limits further enhancement in PCE and device stability. Herein, a new D–π–A‐type zinc pyridine porphyrin derivative (ZnPP) is synthesized and used as a passivation molecular via the antisolvent process for modifying the typical perovskite bulk thin film, leading to a new type of PSC with a graded passivation of the perovskite layer. Impressively, it is found that ZnPP treatment significantly improves the quality of perovskite films and reduces charge transport losses through passivating the uncoordinated Pb2+ cations, yielding devices with a high efficiency of 21.08% with fill factor (FF) of 82.91% and demonstrating the promise of integration of perovskite bulk thin films with tailor molecular via graded modification.

Multifunctional Iron–Porphyrin Additive for Hole‐Transporting Layer Toward Efficient and Stable Perovskite Solar Cells

“…Compared with FePP, the stretching vibration peaks of C═O, C─N, and N─H bonds of mixture of FePP and PbI 2 exhibited a redshift, confirming that FePP can interact with Pb 2þ in perovskite. [30,41] Furthermore, XPS measurements were conducted, and the results are presented in Figure 3c and S11, Supporting Information. After passivated by FePP, the peaks of Pb 4f 5/2 and Pb 4f 7/2 of perovskite films were shifted from 143.30 and 138.40 eV to 143.10 and 138.20 eV, respectively, confirming that FePP can passivate the undercoordinated Pb 2þ defects of perovskite.…”

Phthalocyanines, porphyrins and other porphyrinoids as components of perovskite solar cells

“…The stability tests of unencapsulated devices showed a retention of 98% PCE after 1000 h with 50% RH. 109 Zheng et al synthesized a conjugated antiaromatic donor–acceptor type Por-diketopyrrolopyrrole ( ZnTFP-DPP ; Fig. 20f) to apply as a light absorber additive in planar n–i–p PSCs.…”

Advances and prospects of porphyrin derivatives in the energy field

“…4a) by graing pyridine functional groups onto a porphyrin and used it as a passivation molecule to modify the perovskite bulk thin lm. 23 The triarylamine persuade in the porphyrin molecule can not only act as an electron donor to enhance the coordination ability of the pyridine group with Pb 2+ but also augment the steric hindrance to reducing the aggregation of porphyrin molecules. Therefore, the crystallinity of perovskite lm adjusted with ZnPP was improved compared to a control group without additives.…”