The PhD program at IIS aligns to your aspiration and interest in areas related to sustainability. There is no limitation on which specific area you can choose for the topic of your research. Range can vary from fundamental research in sustainability sciences to materials to architectural styles, to construction, to energy/power, and application of technologies such as AI/ML, IoT, 5G, Edge, Cloud, Quantum computing across the entire spectrum.
The following broad categories are just to provoke thoughts but there is no limitation – 

Sustainable power generation:
Point of application energy includes solar, hydel, geothermal, wind, atmospheric cold, buoyancy, gravity, solar lens, freeze turbine, power gym, pedal powered/animal powered Augmented, immersive and virtual realities: Eliminate the need to travel for the purpose of tourism, shopping, and work 

Experiential Sustainable Living options:
Ecotourism, experiential travel, integrated living communities, integrated and sustainable living, integrating ancient and modern life-styles, healing techniques, preventive healthcare.

Green Virtual Currency and Loyalty:
Altruistic gamification, green loyalty, green digital virtual currency, inside-out marketing, global cross-reference identifiers, financing for sustainability initiatives.

Lowering sea levels:
Integrated water management systems, plankton growth, diverting flood waters, creating new lakes, lining lakes to prevent water erosion 

AI/ML, IoT, 5G, Edge, Quantum Computing, Robotics:
Technology applications for sustainability, integrating multiple technologies, defining new ones, AI/ML models, simulations to predict and evaluate impacts.

Air, Water, Soil:
Biosphere as a whole – comprising of hydrosphere, lithosphere, atmosphere, air/water/soil quality management, AI/ML models, alternative quality improvement techniques and evaluation thereof, simulation models, experimental setups, impact
analysis.

Sustainable Architecture and Construction:
Alternative architectural strategies for town, village, mega-city planning, simulation setups, digital twins, experimentation with locally sourced sustainable materials in construction such as bamboo, mud, husk, agricultural waste, community engagement models, AI/ML models for impact and evaluation analysis

Sustainable Materials:
Fundamental research in Sustainable Materials, locally sourced by the geography, strength testing, suitability and adaptability analysis, experimental setups, fusion, impact and evaluation analysis using AI/ML models, IoT integration

Circular economy:
Recycle, reuse, reduce, refuse, impact of vertical and horizontal integrations, converting wastelands to wonderlands, self-sufficient to interdependent economies, supply-chains, zero-plastic, zero-toxic, zero waste communities

Sustainability sciences:
Fundamental research in sustainability sciences related to air, soil, water quality management

Innovation in ESG reporting:
Use of blockchain, traceability of funds to actual implementations, impact evaluations, transparency in reporting through near real-time dashboard monitoring, causing change

Disaster management:
IoT/5G sensor driven warning and alarm systems, preventing damage to crops, flood prevention through timely water diversion, SCADA systems.