Unraveling the effect of mixed charge carrier on the electrical conductivity in MAPbBr(3) perovskite due to ions incorporation

Autor(es)

Freitas, Andre L. M. ; Tofanello, Aryane ; Bonadio, Ariany ; Souza, Jose A.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 33, n. 23, p. 18-pg., 2022-07-15.

Resumo

We have investigated the role of H+, Bi3+, and Sb3+ ions incorporation on the structural, morphological, optical, and transport properties in MAPbBr(3) perovskite. A comprehensive study of the Bi/Sb- and H+-doped samples on electrical transport properties as a function of light, and within the solar cell working temperature window reveals a hidden effect on the charge transport. Interestingly, Bi-doped samples produced at different acid concentrations showed an anomalous photoconductivity effect at room temperature accompanied by a suppression of photoluminescence emission peak suggesting the creation of non-radiative energy levels. Our results put forward that the coexistence of Bi3+ and interstitial protons in the doped samples collaborate to the detriment of electrical conductivity causing a large hysteresis during the thermal cycles, differently from the observed for the Sb-doped counterpart. Therefore, we pointed out that the presence of H+ ions in high concentration during the synthetic procedure associated with bismuth ions brings about harmful hysteresis and anomalous photoconductivity effects close to the solar cell working temperature which in turn causes degradation and low stability of the devices. (AU)

• Processo FAPESP: 18/14181-0 - Síntese, caracterização e simulação computacional de perovskitas APbX3 (a = CS e CH3NH3; X = i, Cl e Br) híbridas
• Beneficiário: Ariany Bonadio
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 17/02317-2 - Interfaces em materiais: propriedades eletrônicas, magnéticas, estruturais e de transporte
• Beneficiário: Adalberto Fazzio
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/15682-3 - Síntese e caracterização das propriedades físicas de materiais semicondutores micro/nano estruturados
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/09563-1 - Síntese e caracterização de filmes de perovskitas CH3NH3PbX3
• Beneficiário: André Luiz Martins de Freitas
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 21/11446-6 - Semicondutor de perovskita de haleto de baixa dimensão para conversão de energia solar
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular