Increasing the efficiency of a multilayer bulk heterojunction solar cell using water-soluble conjugated polymer as an electron injection layer

• Published in: Journal of Information Display Vol. 17; no. 1; pp. 37 - 41
• Main Authors: Nam, Eun-Hui, Lee, Dong-Hun, Kim, Chung-Gi, Namkung, Han-Sol, Park, Dong-Kyu, Woo, Hyung-Suk
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 02.01.2016; 한국정보디스플레이학회
• Subjects: active layer; bulk heterojunction solar cell; electron injection layer; power conversion efficiency; water-soluble conjugated polymer; Word; 전기공학
• ISSN: 1598-0316; 2158-1606; 2158-1606
• DOI: 10.1080/15980316.2016.1142478

A bulk heterojunction solar cell (BHJ-SC) was fabricated from the conventional active polymer blend P3HT:PCBM by constructing a polymer multilayer structure with novel electron-transporting water-soluble conjugated polymers (WSCPs), poly[9,9′-bis[2-(2-(2-(6′′-(N,N,N-trimethylammonium) ethoxy) ethoxy) ethoxy) ethyl]fluorine, and its copolymer with a phenyl on top of the polymer active layer. In the multilayer structure BHJ-SC, each WSCP coordinated by Na + ions to the oxygen site on the side chain of the polymer acts as a good electron injection layer for the higher electron collection at the cathode metal. This causes up to 85% increase in the BHJ-SC's power conversion efficiency (PCE) compared to that of the BHJ-SC without WSCPs. This report will discuss the effect of the electron injection layer in the BHJ-SC in terms of the current/voltage characteristics, PCE, electron affinity, and charge mobility of water-soluble polymers.