Low-Temperature Solution-Processed Solar Cells Based on PbS Colloidal Quantum Dot/CdS Heterojunctions

被引：122

作者：

Chang, Liang-Yi ^{[1
]}

Lunt, Richard R. ^{[2
]}

Brown, Patrick R. ^{[3
]}

Bulovic, Vladimir ^{[4
]}

Bawendi, Moungi G. ^{[5
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA

[3] MIT, Dept Phys, Cambridge, MA 02139 USA

[4] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[5] MIT, Dept Chem, Cambridge, MA 02139 USA

来源：

NANO LETTERS | 2013年 / 13卷 / 03期

基金：

美国国家科学基金会;

关键词：

PbS; CdS; quantum dot; chemical bath deposition; heterojunction; solar cell; DETAILED BALANCE LIMIT; THIN-FILMS; DOT PHOTOVOLTAICS; EFFICIENCY; OPTIMIZATION; NANOCRYSTALS;

D O I：

10.1021/nl3041417

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

PbS colloidal quantum dot heterojunction solar cells have shown significant improvements in performance, mostly based on devices that use high-temperature annealed transition metal oxides to create rectifying junctions with quantum dot thin films. Here, we demonstrate a solar cell based on the heterojunction formed between PbS colloidal quantum dot layers and CdS thin films that are deposited via a solution process at 80 degrees C. The resultant device, employing a 1,2-ethanedithiol ligand exchange scheme, exhibits an average power conversion efficiency of 3.5%. Through a combination of thickness-dependent current density-voltage characteristics, optical modeling, and capacitance measurements, the combined diffusion length and depletion width in the PbS quantum dot layer is found to be approximately 170 nm.

引用

页码：994 / 999

页数：6

共 32 条

[31] Quantum Dot Photovoltaics in the Extreme Quantum Confinement Regime: The Surface-Chemical Origins of Exceptional Air- and Light-Stability [J].