Journal Article

PUBDB-2026-02891

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Degradation Mechanisms Associated with Electron‐Blocking Layers in Inverted Perovskite Solar Cells

Jiang, X.Extern* ; Zeng, J. ; Sun, K.Extern* ; Wegener, S. A.Extern* ; Li, Z.Extern* ; Pan, G.Extern* ; Koyiloth Vayalil, S.Extern*DESY* ; Schwartzkopf, M.DESY* ; Xu, B. (Corresponding author) ; Mueller-Buschbaum, P. (Corresponding author)Extern*

2026
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/advs.75170  doi:10.3204/PUBDB-2026-02891

Abstract: The operational stability, especially under thermal cycling conditions, of perovskite solar cells (PSCs) based on different electron-blocking layers (EBLs) is still missing. Here, we investigate the device performance of PSCs based on representative EBLs of NiO$_x$, PTAA, and 2PACz as well as the degradation mechanism using operando grazing incidence wide-angle X-ray (GIWAXS) measurements. 2PACz-based devices achieve an impressive PCE of 25.74% (certified 25.34%), which is significantly higher than 23.35% for NiO$_x$-based and 24.57% for PTAA-based PSCs, attributed to the reduced trap density, prolonged charge carrier lifetime, and suppressed non-radiative recombination. In addition, the 2PACz-based devices exhibit excellent stability under light soaking (>1500 h of T90 lifetime) and rapid solar-thermal cycling conditions (no PCE degradation). Operando GIWAXS demonstrates that this stability originates from a relatively lower lattice distortion at both the buried side and the surface side of the perovskite layer of the 2PACz-based device under the temperature variation during solar-thermal cycling conditions. This work provides experimental evidence for the rational selection of EBL materials and highlights the interface regulation for constructing highly stable perovskite devices.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)390776260 - EXC 2089: e-conversion 2.0 (390776260) (390776260)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2026

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