Size-Dependent Electron Transfer from Colloidal PbS Nanocrystals to Fullerene

被引：54

作者：

Gocalinska, Agnieszka ^{[1
,2
]}

Saba, Michele ^{[1
,2
]}

Quochi, Francesco ^{[1
,2
]}

Marceddu, Marco ^{[1
,2
]}

Szendrei, Krisztina ^{[3
]}

Gao, Jia ^{[3
]}

Loi, Maria A. ^{[3
]}

Yarema, Maksym ^{[4
]}

Seyrkammer, Robert ^{[4
]}

Heiss, Wolfgang ^{[4
]}

Mura, Andrea ^{[1
,2
]}

Bongiovanni, Giovanni ^{[1
,2
]}

机构：

[1] Univ Cagliari, Dipartimento Fis, I-09042 Monserrato, Italy

[2] Univ Cagliari, CNR, INFM, SLACS, I-09042 Monserrato, Italy

[3] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands

[4] Johannes Kepler Univ Linz, Inst Solid State Phys & Semicond, Linz, Austria

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2010年 / 1卷 / 07期

基金：

奥地利科学基金会;

关键词：

QUANTUM DOTS; SOLAR-CELLS; PHOTODETECTORS; INJECTION; ENERGY;

D O I：

10.1021/jz100116t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate a promising organic/inorganic hybrid composite for solution-processable optoelectronics made by lead sulphide nanoparticles and fullerene derivatives, which combine the sensitivity of PbS to the infrared spectrum with the good electron transport properties of fullerenes. Charge separation is the crucial process that determines whether the heterojunction can be the building block for devices converting photogenerated excitons into free charges flowing in a circuit. Subpicosecond spectroscopy techniques on bulk heterojunctions between PbS nanocrystals of various sizes and [6,6]-phenyl-61-butyric acid methyl ester (PCBM) were employed to reveal the ultrafast dynamics of photoexcited carriers, particularly transfer of photoexcited electrons from nanocrystals to PCBM. Electron transfer is found to critically depend on nanoparticle size, occurring for nanocrystals with diameter 4.4 nm and smaller, not for larger ones. Our findings are relevant to the engineering of hybrid solar cells and light detectors based on PbS nanocrystal/fullerene bulk heterojunctions.

引用

页码：1149 / 1154

页数：6

共 32 条

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