2007
DOI: 10.1002/adma.200700837
|View full text |Cite
|
Sign up to set email alerts
|

Efficient Solar Cells Using All‐Organic Nanocrystalline Networks

Abstract: The power conversion efficiencies of organic photovoltaic (PV) cells have steadily increased since the introduction of the donor/acceptor (DA) heterojunction.[1] Further improvements have been reported in entangled or "bulk-heterojunction" (BHJ) structures, where the DA interface is within an exciton diffusion length (∼10 nm) of the site for photon absorption.[2] However, the high series resistance [3,4] of these amorphous blends limits the active layer thickness, leading to low fill factor and reduced light a… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1

Citation Types

6
93
0

Year Published

2009
2009
2015
2015

Publication Types

Select...
8
1

Relationship

0
9

Authors

Journals

citations
Cited by 107 publications
(99 citation statements)
references
References 32 publications
6
93
0
Order By: Relevance
“…At larger thicknesses, the J SC rolls-off due to a reduction in the charge collection effi ciency and saturation in absorption efficiency. [ 12 ] The peak J SC values for the ZEP (1:3) and ZEP (1:4) structures are comparable at ∼ 7 mA cm − 2 . The open-circuit voltage ( V OC ) does not vary signifi cantly with composition for ZEP GHJs, and is nearly constant with active layer thickness ( Figure 2b ).…”
mentioning
confidence: 81%
See 1 more Smart Citation
“…At larger thicknesses, the J SC rolls-off due to a reduction in the charge collection effi ciency and saturation in absorption efficiency. [ 12 ] The peak J SC values for the ZEP (1:3) and ZEP (1:4) structures are comparable at ∼ 7 mA cm − 2 . The open-circuit voltage ( V OC ) does not vary signifi cantly with composition for ZEP GHJs, and is nearly constant with active layer thickness ( Figure 2b ).…”
mentioning
confidence: 81%
“…To our knowledge, the peak effi ciency of (4.2 ± 0.1)% is the highest reported for this materials system, and among a small number of published small molecule OPVs with single-cell η P > 4%. [ 12 ] This high performance is made possible by the ability of the GHJ to allow for the simultaneous optimization of the exciton diffusion efficiency and charge collection effi ciency, representing a highly tunable device architecture for small molecule OPVs.…”
mentioning
confidence: 99%
“…[7][8][9] Moreover, the size of the D and A homophases is crucially important for the diffusion of excitons to the D-A interface and after charge separation for effective charge transport to the electrodes. [2,[9][10][11] Investigation of the morphology of the phase-separated blend layers by transmission electron microscopy (TEM) [12] or X-ray diffraction (XRD) [13] have shed light into this complex puzzle. The use of small molecules in OSCs provides in contrast to polymeric materials another advantage: single crystals suitable for X-ray structure analysis become available providing detailed insight into intermolecular interactions and non-bonding atomic contacts responsible for the observed packing motifs.…”
Section: Doi: 101002/adma201104439mentioning
confidence: 99%
“…In a bulk heterojunction cell, the domains are typically formed by casting from solution, where partially miscible donor and acceptor molecular species phase segregate into a highly interconnected network of nanometre-sized domains [14,16]. In the case of small molecules, similar nanocrystalline domains form by co-deposition of appropriately matched donor and acceptor molecules [17]. For these structures to provide both high efficiency and long operational lifetime, the width of a domain must be considerably shorter than an exciton diffusion length, thus effectively shutting down the non-radiative recombination process.…”
Section: Operating Lifetime Of Organic Photovoltaicsmentioning
confidence: 99%