Thermally StableD_2hSymmetric Donor‐π‐Donor Porphyrins as Hole‐Transporting Materials for Perovskite Solar Cells

Abstract

A series of new D2h symmetric porphyrins (MDA4, MTA4, and MDA8) with donor‐π‐donor structures have been synthesized as the hole‐transporting materials for perovskite solar cells (PSCs). The novel porphyrin molecules feature a D2h symmetrically substituted ZnII porphyrin core and two kinds of donor systems (diarylamine (DAA) and triarylamine (TAA)), which can regulate energy level, increase thermal stability, solubility, and hydrophobicity via long alkoxyl chains. PSC devices based on MDA4 as the HTM showed impressive power‐conversion efficiency (PCE) of 22.67 % under AM1.5G solar illumination. Notably, the device was sent for certification, and a PCE of 22.19 % was reported, representing the highest PCE from porphyrin‐based HTMs. Furthermore, the MDA4‐based PSCs showed excellent thermal stability under 60 °C and RH 60 % and preserved 88 % of initial performance after 360 hours. The strategy opens a new avenue for developing efficient and stable porphyrin HTMs for PSCs.

Dynamic self-assembly of small molecules enables the spontaneous fabrication of hole conductors at perovskite/electrode interfaces for over 22% stable inverted perovskite solar cells

“…4a). 41 The V bi of the devices was obtained from the interceptions of the linear region with the x -axis. The V bi values were estimated to be 1.10 V, 0.99 V, 0.87 V and 1.10 V for BCB-C4PA, CZ-C4PA CZ-C4Br and (sc)BCB-C4PA, respectively.…”

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

“…The hygrothermal stability of encapsulated device with MDA4 was performed at 60% RH and 60 °C in dark conditions retained 90% of initial PCE after 264 h. The photostability was also measured showing a retention of 93.9% of initial PCE after 200 h according to the ISOS-L-1 standard. 86…”

Heterocyclic Functionalized Donor–Acceptor Hole-Transporting Materials for Inverted Perovskite Solar Cells

“…In the pursuit of more stable and highly efficient PSCs, a diverse range of HTMs, including polymeric, , organometallic, ,, and the widely used small organic molecule HTMs, , has been developed. Recent reviews have well-documented many design strategies and the synthesis of high-performing HTMs .…”