Charge separation and minority carrier injection in P3HT-silicon heterojunction solar cells

Sushobhan Avasthi, James Christopher Sturm

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

In this work we investigate the behavior of carrier absorption and minority carrier injection in heterojunction solar cells fabricated by spin-coating the organic semiconductor poly(3-hexylthiophene) (P3HT) on n-type crystalline silicon. Using this structure we recently demonstrated a device with open-circuit voltage (V OC) of 0.59 V and short-circuit currents (I SC) of 22 mA/cm 2 at AM 1.5 conditions [1-2]. In this paper we show, using capacitance-voltage characteristics, that there is a large depletion region in silicon which is responsible for the separation of photogenerated carriers. Furthermore, by measuring minority carrier storage times, we show that the dominant forward-bias dark-current component in these devices is the injection of minority carriers from the anode, through P3HT, in to silicon. This confirms that P3HT functions as a p-type heterojunction contact to silicon that blocks electrons but not holes, explaining the high V OC we observe.

Original languageEnglish (US)
Title of host publicationProgram - 37th IEEE Photovoltaic Specialists Conference, PVSC 2011
Pages2487-2489
Number of pages3
DOIs
StatePublished - Dec 1 2011
Event37th IEEE Photovoltaic Specialists Conference, PVSC 2011 - Seattle, WA, United States
Duration: Jun 19 2011Jun 24 2011

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other37th IEEE Photovoltaic Specialists Conference, PVSC 2011
CountryUnited States
CitySeattle, WA
Period6/19/116/24/11

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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  • Cite this

    Avasthi, S., & Sturm, J. C. (2011). Charge separation and minority carrier injection in P3HT-silicon heterojunction solar cells. In Program - 37th IEEE Photovoltaic Specialists Conference, PVSC 2011 (pp. 2487-2489). [6186450] (Conference Record of the IEEE Photovoltaic Specialists Conference). https://doi.org/10.1109/PVSC.2011.6186450