Enhanced performance of all solid-state quantum dot-sensitized solar cells via synchronous deposition of PbS and CdS quantum dots. (12th December 2019)

• Record Type: Journal Article
• Authors: Mao, Xiaoli; Yu, Jianguo; Xu, Jun; Zhou, Juntian; Luo, Cheng; Wang, Lang; Niu, Haihong; Xu, Jinzhang; Zhou, Ru
• Is Part Of: New journal of chemistry. Volume 44:Number 2(2020)
• Page Start: 505
• Page End: 512
• Publication Date: 2019-12-12
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c9nj05344a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The synchronous deposition of PbS and CdS affords band-structure tailoring and surface recombination passivation for efficient and stable solid-state QDSCs. Abstract : All solid-state quantum dot-sensitized solar cells (QDSCs) have become increasingly attractive owing to their ability to solve the issues of package difficulty and poor long-term stability. However, the commonly used colloidal lead sulfide (PbS) quantum dots (QDs) suffer from having a complicated synthesis with the use of high-temperature, harmful organic solvents and a protective atmosphere. In this work, the synchronous deposition of PbS and CdS QDs, realized through a facile successive ionic layer adsorption and reaction (SILAR), was proposed to construct efficient and stable solid-state QDSCs. This design concept affords two benefits: (1) the synchronous deposition of two sulfides suppresses the excessive growth of PbS QDs in the mesopores of films, thereby ensuring the efficient electron injection from PbS to TiO2 ; (2) the intimate interpenetration of two sulfides allows superior passivation of high-density defects on the surface of PbS QDs, which reduces the severe interfacial charge recombination. As a result, the solid-state (Pb, Cd)S QD-sensitized TiO2 solar cell achieved more than 5 times efficiency enhancement in contrast to the conventional PbS/CdS pattern based device. This work highlights the design of novel QD schemes for high performance solid-state solar cells.