Grain Boundary Passivation by using Polymer-Permeating Method for Highly Efficient and Stable Perovskite Solar Cell
Danbi Kim a, Eunhye Yang a, Yoomi Ahn a, Anqi Zhang a, Sung Heum Park a
a Department of Physics, Pukyong National University, Busan 48513, Republic of Korea
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Danbi Kim, 201
Publication date: 20th April 2022

Organic-inorganic hybrid perovskites are attracting significant attention due to their numerous advantages such as superior optical/electrical properties and solution processability. However, the efficiency of perovskite solar cells and device stability are still limited by the defects which originate from the inevitable formation of perovskite grain boundary and the sensitive dependency of perovskite grain growth. To solve these issues, here we present a simple, efficient polymer-permeating grain boundary (PPGB) method that hydrophobic hole transport materials (HTM) are introduced into the perovskite grain boundary down to the bottom after fabricating dense, single-like perovskite grain. This approach of filled perovskite grain boundary from HTM leads to defect passivation and enhancement of hole extraction with improved highly solar cell efficiency and stability. It was achieved that the modified device has decreasing leakage current, 3.8 times enhancement of hole mobility, as well as reduced trap state density comparing pristine device. Consequently, modified perovskite solar cell performance are significantly enhanced from 16.5 % to 18.6 % with the short circuit current density of 23.2 mA cm-2, the open-circuit voltage of 0.99 V, fill factor of 0.81 and the stability also increases under the ambient environment due to covering perovskite grain from hydrophobic HTM.  

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