Two-dimensional simulations of bulk heterojunction solar cell characteristics

Jonny Williams, Alison Walker

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We present a two-dimensional model of a bulk heterojunction solar cell in which we include the effects of optical interference, exciton diffusion, charge separation via the formation of polaron pairs, and charge transport in two separate interpenetrating phases. Our model shows that the current is increased by an order of magnitude with a full optical model compared to assuming that absorbed photons have a Lambertian profile, and depends much more strongly on applied bias when dissociation via polaron pairs is considered. We find a power efficiency at solar intensities of 1-3% depending on the morphology, and show that the fill factor decreases from 40% at low intensities to 20% at solar intensities because of the increase in the open circuit voltage and decreases much more rapidly at higher intensities due to the decrease in the power efficiency.
Original languageEnglish
Pages (from-to)424011
Number of pages1
JournalNanotechnology
Volume19
Issue number42
DOIs
Publication statusPublished - 2008

Fingerprint

Heterojunctions
Gene Conversion
Solar cells
Light interference
Open circuit voltage
Excitons
Charge transfer
Photons
LDS 751

Keywords

  • Solar cells
  • Heterojunctions
  • Two dimensional
  • Solar equipment
  • Polarons
  • Solar energy
  • Photovoltaic cells

Cite this

Two-dimensional simulations of bulk heterojunction solar cell characteristics. / Williams, Jonny; Walker, Alison.

In: Nanotechnology, Vol. 19, No. 42, 2008, p. 424011.

Research output: Contribution to journalArticle

@article{d2531ad43b2a478a9df4c6ff673d69ea,
title = "Two-dimensional simulations of bulk heterojunction solar cell characteristics",
abstract = "We present a two-dimensional model of a bulk heterojunction solar cell in which we include the effects of optical interference, exciton diffusion, charge separation via the formation of polaron pairs, and charge transport in two separate interpenetrating phases. Our model shows that the current is increased by an order of magnitude with a full optical model compared to assuming that absorbed photons have a Lambertian profile, and depends much more strongly on applied bias when dissociation via polaron pairs is considered. We find a power efficiency at solar intensities of 1-3{\%} depending on the morphology, and show that the fill factor decreases from 40{\%} at low intensities to 20{\%} at solar intensities because of the increase in the open circuit voltage and decreases much more rapidly at higher intensities due to the decrease in the power efficiency.",
keywords = "Solar cells, Heterojunctions, Two dimensional, Solar equipment, Polarons, Solar energy, Photovoltaic cells",
author = "Jonny Williams and Alison Walker",
year = "2008",
doi = "10.1088/0957-4484/19/42/424011",
language = "English",
volume = "19",
pages = "424011",
journal = "Nanotechnology",
issn = "0957-4484",
publisher = "IOP Publishing",
number = "42",

}

TY - JOUR

T1 - Two-dimensional simulations of bulk heterojunction solar cell characteristics

AU - Williams, Jonny

AU - Walker, Alison

PY - 2008

Y1 - 2008

N2 - We present a two-dimensional model of a bulk heterojunction solar cell in which we include the effects of optical interference, exciton diffusion, charge separation via the formation of polaron pairs, and charge transport in two separate interpenetrating phases. Our model shows that the current is increased by an order of magnitude with a full optical model compared to assuming that absorbed photons have a Lambertian profile, and depends much more strongly on applied bias when dissociation via polaron pairs is considered. We find a power efficiency at solar intensities of 1-3% depending on the morphology, and show that the fill factor decreases from 40% at low intensities to 20% at solar intensities because of the increase in the open circuit voltage and decreases much more rapidly at higher intensities due to the decrease in the power efficiency.

AB - We present a two-dimensional model of a bulk heterojunction solar cell in which we include the effects of optical interference, exciton diffusion, charge separation via the formation of polaron pairs, and charge transport in two separate interpenetrating phases. Our model shows that the current is increased by an order of magnitude with a full optical model compared to assuming that absorbed photons have a Lambertian profile, and depends much more strongly on applied bias when dissociation via polaron pairs is considered. We find a power efficiency at solar intensities of 1-3% depending on the morphology, and show that the fill factor decreases from 40% at low intensities to 20% at solar intensities because of the increase in the open circuit voltage and decreases much more rapidly at higher intensities due to the decrease in the power efficiency.

KW - Solar cells

KW - Heterojunctions

KW - Two dimensional

KW - Solar equipment

KW - Polarons

KW - Solar energy

KW - Photovoltaic cells

UR - http://www.scopus.com/inward/record.url?scp=56349154924&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1088/0957-4484/19/42/424011

U2 - 10.1088/0957-4484/19/42/424011

DO - 10.1088/0957-4484/19/42/424011

M3 - Article

VL - 19

SP - 424011

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 42

ER -