Chae, Sang Youn Jun, Minki Yoon, Noyoung Joo, Oh Shim Kim, Jin Young Park, Eun Duck 2024-09-19T01:30:23Z 2024-09-19T01:30:23Z 2024-09-19 2025-01 1613-6810 https://pubs.kist.re.kr/handle/201004/150618 Surface engineering of photoelectrodes is considered critical for achieving efficient photoelectrochemical (PEC) cells, and various p-type materials have been investigated for use as photoelectrodes. Among these, the p-type semiconductor/n-type CdS heterojunction is the most successful photocathode structure because of its enhanced onset potential and photocurrent. However, it is determined that the main contributor to the enhanced activity is the Cd-doped layer and not the CdS layer. In this study, a Cd-doped n(+)p-buried homojunction of a CuInS2 photocathode is first demonstrated without a CdS layer. The homojunction exhibited a more active and stable PEC performance than the CdS/CuInS2 heterojunction. Moreover, it is confirmed that Cd doping is effective for other p-type materials. These results strongly suggest that the effects of Cd doping on photocathodes should be carefully investigated when designing CdS/p-semiconductor heterojunction photoelectrodes. They also indicate that the Cd-doped layer has great potential to replace the CdS layer in future photoelectrode designs. English Wiley - V C H Verlag GmbbH & Co. Origin of Enhanced Photoelectrochemical Activity of the n-CdS/p-type Semiconductor Interface: Homojunction or Heterojunction? Article 10.1002/smll.202405048 1 Small, v.21, no.1 Small 21 1 N scie scopus 001308548900001 2-s2.0-85203241975 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article HYDROGEN EVOLUTION THIN-FILM EFFICIENT SOLAR PHOTOCATHODE DESIGN CELLS LAYER CdS CuInS2 Doping Homojunctions Photoelectrodes