Details

Autor(en) / Beteiligte

• Zhi, Xiaoyu
• He, Jun
• Zhang, Zhenhu
• Wang, Shirong
• Liu, Hongli
• Li, Xianggao

Titel

A conjugated Donor-acceptor blend passivation interlayer for the high-performance carbon-based perovskite solar cells

Ist Teil von

• Organic electronics, 2023-10, Vol.121, p.106867, Article 106867

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• The interfacial properties between perovskite active layer and carbon electrode significantly affects the energy conversion efficiency and stability of carbon-based perovskite solar cells. In this work a conjugated Donor-Acceptor blend with a dendrite shaped copper phthalocyanine derivative 8TPAEPC as a donor (D) and Y6 as a typical acceptor (A) was designed to enhance the carrier extraction across the perovskite/carbon interface. The respective D and A molecules form strong interactions with I− and Pb2+ on the surface of perovskite by rich functional group atoms, which can synergistically passivate the non-radiative defects. Moreover, the dipoles from D-A coupling construct a strong internal built-in electric field for further suppression of the unwanted recomination. Compared with 8TPAEPC, 8TPAEPC-Y6 blend exhibits the faster charge interface transfer dynamics. Consequently, Carbon-based perovskite solar cells (C–PSCs) optimized by 8TPAEPC-Y6 achieve champion power conversion efficiency (PCE) of 17.07%, superior to those with 8TPAEPC (16.08%), Y6 (15.68%) and control (14.06%). Meanwhile, the C–PSCs with the hydrophobic 8TPAEPC-Y6 blend greatly improved moisture long-term stability that over 90% PCE could remain as long as 90 days. This work finds out an innovative D-A blend interfacial solution for achieving highly efficient and stable C–PSCs. [Display omitted] •D-A blend interlayer can synergistically passivate perovskite defects.•D-A blend promotes charge transfer and energy level matching at perovskite/carbon electrode interface.•It achieves a champion PCE of 17.07% based on C–PSCs with D-A blend interlayer.