Singlet Exciton Fission-Sensitized Infrared Quantum Dot Solar Cells

被引：190

作者：

Ehrler, Bruno ^{[1
]}

Wilson, Mark W. B. ^{[1
]}

Rao, Akshay ^{[1
]}

Friend, Richard H. ^{[1
]}

Greenham, Neil C. ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

NANO LETTERS | 2012年 / 12卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

Singlet fission; pentacene; lead sulfide; colloidal quantum dot photovoltaics; multiple carrier generation; THIN-FILM; SEMICONDUCTOR NANOCRYSTALS; ELECTRON-TRANSFER; PENTACENE; PHOTOVOLTAICS; ENERGY; LAYER; SPECTROSCOPY; ABSORPTION; EFFICIENCY;

D O I：

10.1021/nl204297u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We demonstrate an organic/inorganic hybrid photovoltaic device architecture that uses singlet exciton fission to permit the collection of two electrons per absorbed high-energy photon while simultaneously harvesting low-energy photons. In this solar cell, infrared photons are absorbed using lead sulfide (PbS) nanocrystals. Visible photons are absorbed in pentacene to create singlet excitons, which undergo rapid exciton fission to produce pairs of triplets. Crucially, we identify that these triplet excitons can be ionized at an organic/inorganic heterointerface. We report internal quantum efficiencies exceeding 50% and power conversion efficiencies approaching 1%. These findings suggest an alternative route to circumvent the Shockley-Queisser limit on the power conversion efficiency of single-junction solar cells.

引用

页码：1053 / 1057

页数：5

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