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SJTU Team Made Progress in PSC Models for Better Stability

December 30, 2020      Author:

Recently, the team led by Professor Han Liyuan and Associate Professor Chen Han from the State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, SJTU has made remarkable progress in the research of efficient and stable large-area modules. The paper "A Scalable Integrated Dopant-Free Heterostructure to Stabilize Perovskite Solar Cell Modules" was published in Advanced Energy Materials (IF=25.245), flagship journal in the field of energy, with SJTU as the first affiliation.

The researchers developed a scalable undoped heterostructure. A perovskite solar cell (PSC) module with an area of 35.80 cm2 employing this heterostructure shows a certified efficiency of 15.3%. The encapsulated PSC modules retain over 91% of initial efficiency after long-term high temperature and high humidity damp heat test. This research proposes a new two-dimensional network strategy for scalable interface engineering, and further paves the way for improving the stability of perovskite batteries.

The first author of this paper is Sha Yongming, postgraduate of 2018 from the School of Materials Science and Engineering, and the corresponding authors are Prof. Chen Han and Bi Enbing from Shanghai Liyuan New Energy Technology Co., Ltd. This work has been supported by the National Key Research and Development Program (2018YFB1500104), Shanghai Natural Science Foundation (17ZR1414800, 20ZR1424900), National Natural Science Foundation of China (11574199, 11674219, 11834011, 51902198), National Postdoctoral Program for Innovative Talents (BX201700302), and National Postdoctoral Fund (2018M640388) and Baotou-Shanghai Jiao Tong University Innovation Guidance Fund (17H100000514).

 

Author: Sha Yongming

Affiliation: School of Materials Science and Engineering, SJTU

Translated by Fu Jing

Proofread by Xiao Yangning, Fu Yuhe

 

ABSTRACT:

Perovskite solar cell (PSC) modules employing a hole transport layer (HTL) without unstable dopants possess high potential for improving operational stability. However, the low efficiencies of the devices greatly limit their commercial applications owing to the lower efficacy of the dopant‐free HTL, introduced by the unintentional n‐doping effect of volatile ions from the halide‐rich perovskite surface. Here, a scalable heterostructure integrated by a methylammonium‐free perovskite film with an iodide‐rich surface, an ultrathin interlayer of bridge‐jointed graphene oxide nanosheets (BJ‐GO), and an HTL without additional ionic dopants is developed. In this heterostructure, the iodide ions are physically immobilized by the compact 2D network, and lead defects are chemically passivated by multiple coordination bonds. Moreover, the BJ‐GO with tunable surface energy enables a highly ordered HTL a considerably improved carrier mobility by an order of magnitude. Finally, the PSC module with an area of 35.80 cm2 employing this heterostructure shows a certified efficiency of 15.3%. The encapsulated PSC modules retain over 91% of initial efficiency after the damp heat test at 85 °C and ≈85% relative humidity for 1000 h, while maintaining 90% of the initial value for 1000 h at the maximum power point under continuous 1‐Sun illumination at 60 °C.