DataVXACS Energy LettersPaper
journal article·2023-07-14Open access

Cationic and Anionic Vacancy Healing for Suppressed Halide Exchange and Phase Segregation in Perovskite Solar Cells

Altaf Pasha, Patatri Pramanik, Jesna K George, Nishant Dhiman, Hao Zhang, Siraj Sidhik, Faiz Mandani, Sudhir Ranjan, Ahipa Tantri Nagaraja, Siva Umapathy, Aditya D. Mohite, R Geetha Balakrishna

ACS Energy Letters· Volume 8· Issue 7
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Source abstract

Abstract

All-inorganic wide-bandgap (WBG) perovskite solar cells are best suited as the top cells for tandem devices. However, they suffer from photoinduced halide segregation (PIHS) and a quick anion exchange reaction (AER). Herein, polyvinylpyrrolidone (PVP) polymer-assisted in situ crystalization of CsPbBr 3 and CsPbBr 1.5 I 1.5 compounds is shown to suppress these effects by passivation of both positively charged (halide vacancy) and negatively charged (cation vacancy) defects. Modifying the perovskite precursor solution with this polymer improved the chemical stability and photostability in both nanocrystal solution and solution-processed films. Ultrafast transient absorption measurements elucidate the excited state dynamics of PVP-modified perovskite and probe an improved lifetime of charge carriers. As a proof of concept, PVP-modified CsPbI 1.5 Br 1.5 retained nearly 98% V oc and 90% PCE under 1 sun AM 1.5G illumination for 12 h, while the control devices lost 25% of their V oc within 6 h. Using simple polymer additives to protect WBG perovskites is a huge step toward new device architectures involving all-perovskite heterojunctions.
Source: openalex_inverted_index · Quality: baseline

Research context

PolymersNanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Nano and Material Sciences, Jain (Deemed to be) University, Jain Global Campus, Kanakapura, Bangalore 562112, Karnataka, India

Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States

Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, Karnataka, India

Applied Physics Graduate Program, Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States

Department of Material Science and Nanoengineering, Rice University, Houston, Texas 77005, United States

Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India

Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, Karnataka, India

Funding

Jain University · Science and Engineering Research Board · Indian Institute of Science · United States - India Educational Foundation · Department of Science and Technology, Ministry of Science and Technology, India · Rice University

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