High Efficiency (>17%) Si-Organic Hybrid Solar Cells by Simultaneous Structural, Electrical, and Interfacial Engineering via Low-Temperature Processes

Sung Soo Yoon, Dahl-Young Khang

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Highly efficient organic–inorganic hybrid solar cells of Si-poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) have been demonstrated by simultaneous structural, electrical, and interfacial engineering with low processing temperature. Si substrate has been sculpted into hierarchical structure to reduce light reflection loss and increase interfacial junction area at the same time. Regarding the electrical optimization, highly conductive organic PEDOT:PSS layer has been formulated with low sheet resistance. It is argued that the sheet resistance, rather than conductivity, is the primary parameter for the high efficiency hybrid cells, which leads to the optimization of thickness, i.e., thick enough to have low sheet resistance but transparent enough to pass the incident sunlight. Finally, siloxane oligomers have been inserted into top/bottom interfaces by contact-printing at room ambient, which suppresses carrier recombination at interfaces and reduces contact resistance at bottom electrode. Contrary to high-temperature doping (for the formation of front surface or back surface fields), wet solution processes or vacuum-based deposition, the contact-printing can be done at room ambient to reduce carrier recombination at the interfaces. The high efficiency obtained with low processing temperature can make this type of cells be a possible candidate for post-Si photovoltaics.

Original languageEnglish
Article number1702655
JournalAdvanced Energy Materials
Volume8
Issue number9
DOIs
Publication statusPublished - 2018 Mar 26

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Sheet resistance
Solar cells
Printing
Polystyrenes
Siloxanes
Light reflection
Contact resistance
Processing
Oligomers
Contacts (fluid mechanics)
Temperature
Doping (additives)
Vacuum
Electrodes
Substrates
polystyrene sulfonic acid
poly(3,4-ethylene dioxythiophene)

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

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title = "High Efficiency (>17{\%}) Si-Organic Hybrid Solar Cells by Simultaneous Structural, Electrical, and Interfacial Engineering via Low-Temperature Processes",
abstract = "Highly efficient organic–inorganic hybrid solar cells of Si-poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) have been demonstrated by simultaneous structural, electrical, and interfacial engineering with low processing temperature. Si substrate has been sculpted into hierarchical structure to reduce light reflection loss and increase interfacial junction area at the same time. Regarding the electrical optimization, highly conductive organic PEDOT:PSS layer has been formulated with low sheet resistance. It is argued that the sheet resistance, rather than conductivity, is the primary parameter for the high efficiency hybrid cells, which leads to the optimization of thickness, i.e., thick enough to have low sheet resistance but transparent enough to pass the incident sunlight. Finally, siloxane oligomers have been inserted into top/bottom interfaces by contact-printing at room ambient, which suppresses carrier recombination at interfaces and reduces contact resistance at bottom electrode. Contrary to high-temperature doping (for the formation of front surface or back surface fields), wet solution processes or vacuum-based deposition, the contact-printing can be done at room ambient to reduce carrier recombination at the interfaces. The high efficiency obtained with low processing temperature can make this type of cells be a possible candidate for post-Si photovoltaics.",
author = "Yoon, {Sung Soo} and Dahl-Young Khang",
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