journal article·2022-04-25

Perovskite Films Treated with Polyvinyl Pyrrolidone for High-Performance Inverted Perovskite Solar Cells

Zhongjun Dai, Jian Xiong, Weizhi Liu, Naihe Liu, Junqian Dai, Yu Huang, Sam Zhang, Qunliang Song, Zheling Zhang, Weizhong Liang, Jin Zhang, Qilin Dai, Jian Zhang

ACS Applied Energy Materials· Volume 5· Issue 4
Publisher page

Abstract

Energy loss and unstable properties of the interface and grain boundaries (GBs) in perovskite solar cells (PSCs) greatly limit the efficiency and stability of PSCs. Here, a polyvinyl pyrrolidone (PVP) treatment is proposed to overcome these challenges. The impact of PVP treatment on perovskite films and the corresponding performance of the devices are systemically investigated. The crystallinity, GBs, and PbI2 residues of the perovskite films are all improved via the interaction of PVP and perovskite crystals, which results in an increased grain size and enhanced built-in electric field in the devices. The trap density is dramatically decreased from 8.74 × 1015 to 4.37 × 1015 cm–3, and the additional interface electrical field of 1.26 × 106 V/cm is formed at the perovskite/PCBM interface, which dramatically eliminates the energy loss of the bulk and interface of inverted PSCs. Based on this strategy, a high power conversion efficiency (PCE) of 20.77% is achieved based on the MAPbI3/PCBM planar heterojunction. In addition, the stability of PSCs is also dramatically improved, and the PCE of PVP devices can retain 80% of its initial value after 14 days in air and can retain 99% of its initial value after 64 days in N2, while the control devices can only retain 44 and 85% of their initial PCE values under the same exposure conditions, respectively.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Quantum Dots Synthesis And Properties

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

Affiliations

Guangxi Key Laboratory of Information Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, P.R. China

Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guilin 541004, P.R. China

Institute for Clean Energy and Advanced Materials, School of Materials and Energy, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Southwest University, Chongqing 400715, P.R. China

Center for Advanced Thin Films and Devices, School of Materials and Energy, Southwest University, Chongqing 400715, P.R. China

Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, Mississippi 39217, United States

Funding

Natural Science Foundation of Guangxi Province · Innovation Project of GUET Graduate Education · The PhD Research Startup Foundation of Guilin University of Electronic Technology · Innovation Project of Guangxi Graduate Education · Bagui Scholars Program of Guangxi · National Undergraduate Training Program for Innovation and Entrepreneurship · Guangxi Science and Technology Plan Project · Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials · Fund of Guangxi Key Laboratory of Information Materials

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