Coating on a cold substrate largely enhances power conversion efficiency of the bulk heterojunction solar cell

Jin Young Oh, Tae Il Lee, Jae Min Myoung, Unyong Jeong, Hong Koo Baik

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Spin-coating a mixture solution of P3HT and PCBM on a cold substrate largely enhanced the power conversion efficiency (PCE) of the bulk heterojunction (BHJ) solar cells. This concept was based on the abrupt decrease in the solubility of P3HT as solution temperature decreased. The selective precipitation of P3HT on the PEDOT:PSS-coated cold substrate facilitated a desirable rich composition of P3HT at the interface with the PEDOT:PSS layer. The high crystallinity of P3HT suppressed the movement of PCBM during thermal annealing, preventing aggregation of PCBM. The morphological excellence of the pristine film gave a comparable PCE to that made by the conventional fabrication process. After thermal annealing, the device made via coating on a cold substrate showed above 30% increase in PCE from the BHJ solar cells made by the conventional method. Spin-coating a mixture solution of P3HT and PCBM on a cold substrate successfully generates a desirable bulk heterojunction (BHJ). This simple process increases the power conversion efficiency by 30-40% compared with the BHJ solar cells made by the conventional method.

Original languageEnglish
Pages (from-to)1066-1071
Number of pages6
JournalMacromolecular rapid communications
Volume32
Issue number14
DOIs
Publication statusPublished - 2011 Jul 15

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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