Enhanced Device Performance with Passivation of the TiO2 Surface Using a Carboxylic Acid Fullerene Monolayer for a SnPb Perovskite Solar Cell with a Normal Planar Structure

Kengo Hamada, Ryo Tanaka, Muhammad Akmal Kamarudin, Qing Shen, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Taro Toyoda, Tingli Ma, Dong Won Kang, Shuzi Hayase

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Research on tin-lead (SnPb) perovskite solar cells (PSCs) has gained popularity in recent years because of their low band gap, which could be applied to tandem solar cells. However, most of the work is based on inverted PSCs using PEDOT:PSS as the hole-transport layer as normal-structure PSCs show lower efficiency. In this work, the reason behind the low efficiency of normal-structure SnPb PSCs is elucidated and surface passivation has been tested as a method to overcome the problem. In the case of normal PSCs, at the interface between the titania layer and SnPb perovskite, there are many carrier traps observed originating from Ti-O-Sn bonds. In order to avoid the direct contact between titania and the SnPb perovskite layer, the titania surface is passivated with carboxylic acid C60 resulting in an efficiency increase from 5.14 to 7.91%. This will provide a direction of enhancing the efficiency of the normal-structure SnPb PSCs through heterojunction engineering.

Original languageEnglish
Pages (from-to)17776-17782
Number of pages7
JournalACS Applied Materials and Interfaces
Volume12
Issue number15
DOIs
Publication statusPublished - Apr 15 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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