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Proceedings Paper

Charge dynamics in alkanedithiols-additives in P3HT:PCBM bulk heterojunction solar cells
Author(s): Ankur Solanki; Bo Wu; Yeng Ming Lam; Tze Chien Sum
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Paper Abstract

Addition of a small fraction of high boiling point solvent into the host of donor/acceptor blend is one the best approach to control the morphology in order to enhance the power conversion efficiency of organic bulk heterojunction (BHJ) solar cell devices. Herein, we focus on the effect of two thiol-based additives (1,6-hexanedithiol (HDT) and 1,5-pentanedithiol (PDT)) on the charge dynamics of P3HT:PCBM blend system, studied by transient absorption spectroscopy (TAS) and correlated with the solar cell device performance. TAS reveals a more efficient charge generation and polaron formation in the systems with additives as compared to those without (NA systems), at the onset which persists up to few microseconds. The recombination dynamics also exhibits the reduced recombination losses on adding these additives in this system; however, there is marginal change of recombination dynamics in PDT added system with the control. These charge dynamics were validated using the analytical model proposed in our previous work and also correlated with improved device performance (ηNA = 0.9%, ηHDT = 2.7%, ηPDT = 1.6%).

Paper Details

Date Published: 6 October 2014
PDF: 7 pages
Proc. SPIE 9184, Organic Photovoltaics XV, 91841W (6 October 2014); doi: 10.1117/12.2061434
Show Author Affiliations
Ankur Solanki, Nanyang Technological Univ. (Singapore)
Bo Wu, Nanyang Technological Univ. (Singapore)
Yeng Ming Lam, Nanyang Technological Univ. (Singapore)
Tze Chien Sum, Nanyang Technological Univ. (Singapore)
Singapore-Berkeley Research Initiative for Sustainable Energy (Singapore)

Published in SPIE Proceedings Vol. 9184:
Organic Photovoltaics XV
Zakya H. Kafafi; Paul A. Lane; Ifor D. W. Samuel, Editor(s)

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