Layer-by-Layer Self-Assembly of Hollow Nitrogen-Doped Carbon Quantum Dots on Cationized Textured Crystalline Silicon Solar Cells for an Efficient Energy Down-Shift

Mumtaz Ali, Rabia Riaz, Soohyun Bae, Hae Seok Lee, Sung Hoon Jeong, Min Jae Ko

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Enhancing the efficiency of the crystalline silicon solar cell (c-Si SC) by coating the energy shifting layer with quantum dots (QDs) is a recent approach to efficiently utilize the high-energy spectrum of light. Carbon QDs are an attractive candidate for such applications; however, a small Stokes shift and nonuniform coating due to high aggregation are the bottlenecks to fully utilize their potential. For this purpose, here, we propose a layer-by-layer self-assembled uniform coating of eco-friendly red-emissive hollow nitrogen-doped carbon QDs (NR-CQDs) as an efficient energy-down-shifting layer. A unique hollow and conjugated structure of NR-CQDs was designed to achieve a large Stokes shift (UV-excited red emission) with a quantum yield (QY) comparable to Cd/Pb QDs. A highly uniform coating of intrinsically negatively charged NR-CQDs on c-Si SCs was achieved by cationizing the c-Si SC by bovine serum albumin (BSA) under mildly acidic conditions. By an opposite-charge-assisted, self-assembled overlayer, the short-circuit current density (Jsc) and power-conversion efficiency were increased by 5.8%, which is attributed to the large Stokes shift (255 nm) and high QY. Blue-emissive undoped carbon QDs were synthesized for comparison with the proposed NR-CQDs to elucidate the significance of the novel proposed structure.

Original languageEnglish
Pages (from-to)10369-10381
Number of pages13
JournalACS Applied Materials and Interfaces
Volume12
Issue number9
DOIs
Publication statusPublished - 2020 Mar 4

Bibliographical note

Funding Information:
This work was supported by the Research Program (no. 2018R1A2B2006708), the Global Frontier R&D Program on Center for Multiscale Energy Systems (no. 2012M3A6A7054856), and the Technology Development Program to Solve Climate Changes (no. 2017M1A2A2087353) funded by the National Research Foundation under the Ministry of Science and ICT, Republic of Korea.

Publisher Copyright:
© 2020 American Chemical Society.

Keywords

  • cationization
  • crystalline silicon solar cells
  • layer-by-layer, self-assembly energy down-shift
  • nitrogen-doped carbon quantum dots
  • photoluminescence

ASJC Scopus subject areas

  • General Materials Science

Fingerprint

Dive into the research topics of 'Layer-by-Layer Self-Assembly of Hollow Nitrogen-Doped Carbon Quantum Dots on Cationized Textured Crystalline Silicon Solar Cells for an Efficient Energy Down-Shift'. Together they form a unique fingerprint.

Cite this